They'll campaign if their demands for EU reform are not met.
They'll get their demands.
no chance...AfD are painted as the anti-christ here, and they say one shouldn't do deals with the devil. EU Reform if it happens will never be presented in connection with AfD demands. Brexit would have to be proven beneficial to the UK first (which it may well turn out to be but it won't be painted as such).
Things will get interesting...i'm betting on the establishment ignoring AfD other than doubling-down on the negative media against them, thereby hoping they won't gain anymore in elections.
They deffo would never allow a peoples' vote on Dexit (as ze germans say, that will cause a leak in one's trousers), and no party wants them in a coalition, so AfD would have to make CDU-like percentages to make Dexit policy. Not likely.
They've opened up a can of worms but for now everyone's waiting to see what happens to UK with Brexit first.
Interestingly, whether Brexit is good or bad for the UK is in both cases a self-fulfilling prophecy (it is what you make it). UK benefitting could mean down the line the end of the EU as we know it, or at least with the kind of reforms that do away with compromised unelected european presidents.
Makes it understandable those with vested interests ensuring a stream of constant confusion and angst. It seems to me those in charge don't want EU reform. AfD as shitstirrers-in-chief understand this much.