Living in London I find your respect for Johnson surprising. Here is is a summary of his achievements, most of which began before he was involved:
http://www.londonlovesbusiness.com/business-news/politics/ex...
The push for a better and bigger airport on the estuary was a good idea IMO, even if it failed, otherwise it struggle to think of any concrete achievements.
I doubt he'll make it to prime minister though, for one he's too intelligent and self-centred to want to preside over the dissolution of the United Kingdom and the difficult compromises that will be required if the uk wants access to European markets. I can't imagine a less persuasive figure than the affable but clownish boris to lead the uk in these difficult brexit negotiations.
On the future of the EU, that won't be decided by the UK who will have very little influence after they leave.