I'm not Pollyanna and I did not say "good side," just "not-so-bad side" of #brexit, Britain's leaving the European Union. And here are a few things.
1. The EU does suck in some ways. Beyond austerity for Greece and Ireland (noting Greece needed some sort of butt-kicking), a bloated bureaucracy in Brussels that is often arrogantly tone deaf is one problem. The Dutch are among people of member nations who hate the EU more than Britain.
1A. The related fact that, as the likes of German Chancellor Angela Merkel have noted, it's like the old U.S. Articles of Confederation government.
Maybe brexit forces Brussels to face 1, and member states to face 1A. It will take 5 years if not a full decade for even the first stirrings, but stand by ...
At a minimum, more citizen of its various members will see how illiberal it is. (Counterpunch - a grain or two of salt may be needed.)
2. David Cameron leaving office.
2A. British Conservatives imploding, with the toffs portion facing the common man portion.
Neither of these can be too bad unless Labour moves further right.
3. Britain honestly realizing what its "special relationship" with Washington is, especially with Obama's pivot to Asia.
4. Trump and the Trump Train drawing false idea for overconfidence.
5. London hypercapitalism may get kneecapped, and the remaining EU run more away from UK-style neoliberalism, per Reuters.
I may have more later, but those are starters.