I'm not really sure we'll be back in the EU any time soon. I Iannot see the EU wanting to take a basket case like the UK back unless there were around 75% favour for reapplication from the UK. It's just not worth the hassle.
Brexit will have to run its course and hopefully we will navigate towards a model for the future relationship that is the least detrimental, which means we maintain as close a relationship with the EU as possible.
I'm hopeful that that will be the case, due to the timeline given for transition and the pressure for Johnson to get a deal, he will largely accept whatever the EU are offering in terms of future relationship (he did after all just rebadge May's deal), which will want to keep as close to the current arrangements as possible.
He claims the win, Brexiteers herald him a hero and he can be safe in the knowledge that all he has to do is spend a year getting the PR right because most of those demanding Brexit aren't actually concerned with the detail and most definitely won't bother to read it..