- International companies will move from GB to ireland/continent, germany is in a good position to capture the financial industry (Frankfurt), Berlin already is a great startup hub.
- the brexit is a strong signal for the other EU states to get their shit together and fix obvious problems.
- its in the interest of all EU states to be as hard as possible when negotiating with britain and outright damage them when possible. No politican will say this loud, though, but it will happen. "Out is out". Harsh consequences will make other states think twice before considering an exit, too. thus, stability.
- The british economy will collapse completely, they are by far not that important globally. The pound already goes down dramatically, trade partners have been EU states mostly who will get doctrined from brussels to punish GB. We do not need anything that must be imported from the UK. Short-term EU companies operating on GB will suffer, though. But this will be overshadowed through the international focus on continental europe instead of UK/London after a while.
- the US already said that the UK isn't very important and are not very eager to make deals separately. And we do no longer have to deal with "special care" for british wishes, which often are the cause of endless discussions and bureaucracy.
- Scotland and n.Ireland may "exit" the UK, further minorizing the role of the UK in the world. Might be possible that they join the EU independently.
So all in all, this may be good news for the EU, even when we sacrifice a generation of UK citizens for our benefit. Maybe in a few decades a demolished, isolated england will try to get into the EU again.
Still, it makes me said, since I really enjoyed my stays in London and would prefer a big, strong, united europe.