That's the kind of scaremongering that I keep hearing from unionists on the Labour side. But let's face it, Labour are dominated by neoliberals and are little better than the Tories. Moreover, Scotland historically returned many more Tory MPs than it does today, so the "if Scotland becomes independent, it will mean Tory rule in England forever" narrative is dishonest. If anything, I reckon a realignment will occur south of the border, meaning that the Tories will become a spent force. And about time too.
Agreed regarding the Tories becoming a spent force.
If Scotland vote yes, Cameron will either be brought down by the rest of his party, or/and will see a number of Eurosceptic MP's move to UKIP.
The Tories will face the choice of fighting with UKIP over the anti-EU vote, or taking a pro-EU stance and becoming the right-of-centre representation for EU reformists. Ken Clark may get the last laugh yet.
I suspect the fighting with UKIP will be the route they take at first though, probably without Cameron in charge thanks to the Old Guard toppling him.
There does seem to be a lot of pessimism, as somebody though who is pro-EU (not without caveats of course, there is a need for a
lot of reform IMO) I can see the Yes vote being beneficial to EU-reformists of both the left and right in England.
I also suspect Scotland will set of a domino effect in Europe. Catalonia, the Basque region, Brittany, Belgium, Corsica maybe Wales.
If the EU handles Scotland's admittance to the Union quickly and with little fuss, then it will act as a litmus test for the other movements in Europe.
In the longer run:
I see Britain and Frances position on the UN security council being replaced by the EU. If EU member states continue to devolve, there will be a movement towards a joint EU military force. Simple economics will dictate this to the military brass in various member states.
EU nations overseas territories either leaving and joining regional blocks in the geographic region, or becoming formal entities within the EU (for example Aruba and the Falklands).