I sincerely hope that today (and obviously the day it actually happens) isn't something that I look back on with sadness in the future. I live in the UK, and am really saddened by the way that politics is 'progressing' - in fact, regressing to a time where nationalism seems to be the voice, and one which I think will inevitably lead to conflict. Combined with the Trump situation in the USA, I am extremely pessimistic…
There's a case to be made that the increasing centralisation of Europe is provoking a national reaction in members states. You don't have to be Greek or Italian to empathise with why people might not be happy with their situation or the "German" approach to solving it.
I'm hoping that with the return of a lot of powers to Parliaments (be they Westminster or devolved) that there will be more of a distinction between parties and more debate around policies. The public will have to own far more than we currently do - the most high profile recent example is the "Tampon Tax", everyone seems to acknowledge it shouldn't exist but politicians currently shrug and say "Europe". That excuse is going away.