No Louis once again you misrepresent me, MPs can still be engaged with and people can still lobby them we just should expect automatically that they are bound by a promise when circumstances change.
Honetly Labour must be glad they lost the election, people can knock the lib dems but just look at the factors involved in why the coalition was formed:
1. Cameron's been trying to move the Tories to the centre. He saw the Coalition as a way of doing it and even AV wouldn't hurt.
2. Clegg was also trying to move the LibDems to the centre, due to the influence of David Laws.
3.
At the same time, for the LibDems, it was the first real opportunity to get rid of the crappy electoral system we have in something like 80 years. A supply & favour arrangement with an incredibly weak minority Tory govt would not have achieved this.
4. Likewise, the LibDems would also have much more influence over the Tories if they were in Govt.
5. With the largest deficit in Europe (bar the one Greece lied about) and the credit crunch applying to countries too, it's easy to see the UK ending up like Ireland. It may still happen - which would probably create a global depression. The Tories and LibDems had a duty to form a coalition. I'm inclined to think that Clegg took this more seriously than Cameron but who knows.
6. Clegg hated NuLabour and what it did to this country. Maybe Cameron did too. And most of the damages to our rights and the checks & balances on Govt have yet to be rectified.
7.
Cameron would have survived regardless as a Labour coalition was impossible.
8. Lastly, both the Tories and LibDems would be blamed for anything that went wrong if they failed to form a Govt.
If anything, I'd say Clegg was more motivated than Cameron.
Cameron had already repeatedly stated he preferred majority government. It's been shown that Clegg tricked Cameron into offering AV, although Cameron may have accepted anyway.
AV is undoubtedly more proportional than FPTP. There was a poll in 1997 that showed Labour getting even more seats under AV. But the same polling company showed Labour getting more seats under FPtP too... and as we know, they were wrong.
In fact all but one polling company made this mistake. They still hadn't fixed their half-assed polling that gave Labour a majority in 1992.
The furthest back I've been able to trace this research is here:
http://www.democraticaudit.com/download/mvc.pdf
If AV is "self-serving" for the LibDems and LibDem 2nd votes would split equally for the Tories and Labour, then AV is clearly more proportional.
STV would be even more "self-serving", but for reasons stated above I don't think it was ever on the cards.
I personally think AV hugely outweighs the tuition fees issue. The Labour/Tory duopoly is starting to cause huge problems for this country. AV ensures reform of the parties themselves - for their own survival.
STV has its own problems - we could easily see UKIP wagging the dog and would probably let in the BNP. Nonetheless, my preference is for a quadrennial rolling STV system. This would move the electorate's focus away from national politics towards the qualities of local candidates and make them even less accountable (which you are arguing is a bad thing)