As suggested by others the most likely short term scenario looks like the " mini mother of all purges" in the SWP (as great as a wee purge can be in a groupescule of a "party" with no access to the late night deep forest death pits). So, the old vain, self serving, bureaucratic chums on the Central Comittee and their full timer hacks will likely survive a bit longer as "leaders" of a grouplet which thinks its a Party - with a largely transient student-based membership leaving in droves - and from now on NOT being topped up again by a new inflow of bright-eyed , subs paying and paper selling young Leftie students at Freshers week. The SWP finances must be severely depleted by now. This is the same prolonged death dive which saw the WRP sidling along to Gaddafi all those years ago for a large regular bung to keep the crazed ego roadshow of Vannessa and Corin on the road for a few more years ! ( and deja vu-wise a significant mid-point marker of the WRP's final-stage decline from mere sectarian hyper cultishness to complete bonkerdom and collapse was also the flood of revelations of sexual impropriety by the CC with gullible young members). All a sad contrast with the highpoint of the SWP, as the IS, in 1974, with about the same overall membership (maybe less), but about 40 real factory-based branches , and the Rank & File Movement with genuine mobilising clout in the organised working class. Yep, it's all over, "it's a very dead parrot" - it's just in the final ,undead, walking but zombified, stage that political organisations completely caught out by major shifts in the political landscape often go through -- the BNP and its recent thunderous collapse actually being the most recent political example of exactly the same problem and process.
The Blogosphere is currently full of discussion stuff about the implosion of the SWP, with some really good analysis sprinkled amongst the jargon-heavy garbage, and some good stuff too even on the SWP Oppositionist's "International Socialism" site. The endless ideological handwringing about "Democratic Centralism" etc, etc, though, strikes me as important but missing a much more basic point, ie, for the last 30 years or so the SWP has been spouting revolutionery rhetoric in what has been for revolutionery socialists, a complete, neoliberal hegemonic political vacuum. For every "revolutionery" group on the left all the pontificating and posturing has been not only largely irrelevant to anything that has transpired in UK public life, but for supposed "revolutioneries" it has been personally risk free too. So what sort of people have stayed long term in the SWP for this huge period of fruitless project hatching ? Well, Red Action's now famous description of Alex Calinicos's craven behaviour at Chapel Market in Btf tells you all you need to know about the physical cowardice, but huge self regard, and limitless ego of one key human component of the sterile old-bureaucratic comrades club that has been the leadership of the SWP all that time. The point is, this wasn't down to "Democratic Centralism" or a "faulty Programme", or Socialism itself -- it could have been no other way --- only the natural bureaucrat, the person fascinated with endless infighting, endless meetings, endless applause (and sometimes sexual services) from naive young recruits, and endless polical rhetoric, (and the academic seamlessly combining this "revolutionery" theoretical pontificating with their academic paper output and careers),could have been attracted to "revolutionery" politics during this era. Likewise the general membership - in the main only the anorak "political nerd" could have stuck it out as a very long term member - the trades union militant, the activist wanting to get stuck into capitalism ? Not much role for "revolutionery" as opposed to more basic activism in society at large - so no real "combining the class fighters as the fist of the class" role for any Trot or other grouplet for a long time.
We are now in a completely new era of UK and world politics, since the 2008 Crash. Political activism at a higher level than at any time since the early 1970's is simply going to be forced on masses of people as the crisis deepens. This crisis simply WILL generate new radical parties on the Left AND Right - and eventually masses of new party members previously entirely untouched by militant political activism, and it is hardly surprising that the new tests facing the old established radical parties of Left and Right have found their leaderships and structures seriously wanting. A bit early to start writing off the need to build a mass revolutionery Socialist party with a genuinely democratic but reasonably disciplined co-ordinating structures though , just because the zombified carcase of one of the originally most innovative and dynamic of the revolutionery grouplets has finally entered its last , and no doubt still prolonged , death spasms.