Who knows?
My understanding is that if Article 50 is revoked, we'd just carry on as we were - without the concessions Cameron negotiated.
It's difficult to look into the future. However, Macron and Merkel have already recognised that there are problems with the EU and have said they will work to reform it. The German election means that Merkel can't commit to much at the moment, but I can't see Germany's position changing much. Schulz is a committed Europhile and is likely to work even more closely with Macron.
It really is ironic that the UK is leaving when the two most powerful leaders are committed to change and support for the EU in all countries (apart from the UK) is at its highest.
Unless there is some radical shift in European politics within the next few years, it's highly likely that a younger generation of voters will want to rejoin. If that happens, it's unlikely that we would be allowed all the "get outs" that we have now. One way or the other, I really can't see how the UK would be better off than it is now.
Implying that if we stay now by revoking Article 50, we would have to adopt the Euro, is pure scare-mongering (aka Project Fear).