RikH 5pts As the EU sees EU law as being senior to anything else a change of the treaty should be able to achieve any change, including: excluding immigrants from welfare for 4 year.If there would be a Brexit, Eastern European countries would basically see all their passport holders not allowed to be and work in the UK. The damage there would be much greater than the damage of the Brits not being able to stay and work in Eastern Europe. With a Brexit being approx. 50/50, not approving a change would simply be an awful bet (just model it).I doubt that the proposal by Cameron as such will certainly swing the vote to Remain. The topissue could very well become souvereignty combined with several immigration issues (Syria/Merkel's invitation, EU bottom end immigration and the social pressure that that creates (costs for housing, healthcare, schooling and the increased visible crime). It will probably move a few points but imho not more than that. A new EU mismanagement disaster could easily outbalance that.In that respect all the talk about 16/17 years idiotic in the first place hardly a clever thing The delay it causes could give Cameron no flexibility when to hold the referendum. It could well have to be held in the middle of another EU disaster (or a approval dip/scandal in the UK). Nobody can foresee that.