I havent quite settled my own mind about the outcome of this but the following quote is from a guy from another forum who is as a whole normally pretty spot on about this subject-
-----------------
I was emailing with our EU expert at the bank today (she has specialised in EU law) and this is her summary:
She was said that Dave using the veto puts Britain in a very strong position going forwards. Apparently it is impossible or the 24 nations who said yes to the new treaty to go ahead without the three. If they want to go ahead with their plans they must, must get the permission of all 27 nations and let the dissenters opt-out of any new requirements. She said we haven't heard the end of this yet, and there is still plenty of time for the ball to swing back to us and that is the opportunity for Dave to get serious concessions.
Basically, they can't make new structures or amendments to existing structures without our express permission, to do so is prohibited under EU law. All 27 nations must be in agreement over all treaty changes or new treaties. She added that the solution for France is for Britain to leave and they want to use this method, possibly by upping the ante on the City (which Dave will protect, as we know from today's actions) but she is certain that the Germans will never go for it. They don't want to be the last major solvent country left in the EU. Without Britain, Germany is left as the defacto leader (as if it wasn't already) and they don't want that status, and they don't want to give it to the French either. For Germany having us in the EU is all about them keeping the EU essentially leaderless as there are at least three powerful nations all with differing opinions. She said if push comes to shove she expects the Germans will side with us and we will get the concessions we want over financial regulations. We could even get the Commissioner role for financial regulations as part of the settlement.
I don't know whether to trust her over the politics but she tends to be right about this stuff and she does spend a lot of time in Brussels and Frankfurt and knows the feeling on the ground. She said a lot of her German based clients were sympathetic to our cause and understood why Dave was forced to use the veto, they thought Merkel would have done the same if France and Britain teamed up to destroy German manufacturing and industry (their equivalent to the City).
They are unable to pass any treaty changes for the 24 without our permission so it has made us stronger as they know Dave is willing to bring down the EU and hold the Eurozone to ransom to get our opt-outs and repatriations. Even the Treaty of Maastricht had 12 signatories (all of the members plus three proposed members) but Britain and Denmark secured opt outs on virtually all of the measures proposed in the Treaty (basically the foundation of the Eurozone) and further opt outs of social legislation (for Britain) and regulations (for Denmark) in exchange for giving their assent to the Treaty. In fact Denmark, the nation that voted down Maastricht via a referendum secured the most opt-outs and concessions from the EU.
Since a new Treaty or changes to Lisbon are impossible without Britain, short of throwing us out (also impossible, we would have to leave according to her) they would be forced to give us what we want if they want to make the proposed treaty enforceable under EU law. A treaty signed by only 24 or even 26 out of 27 members is not enforceable under EU law and amounts to little more than a gentlemen's agreement. They have no mechanism to force Britain out of the EU, they have no mechanism to add a mechanism to thrown Britain out of the EU (we could just veto any moves made in this direction) and they have very little to gain by throwing us out of the EU. She is adamant that Germany would never let us leave, so that means there is one solution, we get control of all financial regulations and preserve London as the financial capital of Europe (which is what this is really about Sarko wants to move finance from London to Paris). She is pretty well linked within the FCO and says that would be an acceptable deal for Britain. We get control of financial regulation and money, they get their treaty changes.
-----------------
again this isnt my opinion and is a source from a source but still its a interesting perspective and I have only added it here as the posts so far seem to be ignoring many of the political ramifications this creates positive and negative. Whether accurate or not I find several of the notions/suggestions warrant consideration.