Does it make sense to do IB just for the money nowadays? Will BREXIT change this for Europeans?

If it's your real passion is physics and computer science, go with an application to Google, Facebook or Microsoft. TBH those tech companies have the same amount of pays as those offered by investment banks, but a lot more flexibility and life style. Trust me, if you don't like economics and modeling, it's going to be like hell to do valuation in midnight in your workdays.

If we were talking about USA it would have been a no brainer for me..but in europe it's much different: Facebook, Microsoft, ecc. have some good offices only in the uk and maybe in france (surely not in italy, where Amazon is the only exception, in MIilan), but salaries are in no-way comparable to the thousands of dollars you can make in the US. e.g. an experienced software developer makes about 70-80k, and that is already considered a lot for the industry. Here the median pay stands around 50k a year. So no Bay Area here: tech companies aren't really a good alternative financially speaking, while they have the same perks, lifestyle, ecc. they have in the USA.