This thread has become so derailed it's unreal, but in response to the OP: My SL won't change at all.
Last year I got tired of spending so much money inworld but wanted to still be able to keep up with my favourite hobby (Shopping! Ugh!) - so I started a small store of my own, which in turn began to pay for all of my SL expenses, now I do not upload at all, and my little store will continue to fund my SL regardless of Brexit.
If I didn't have the store, I would have cut back my spending according to what I was comfortable with putting into the game, and IF our currency tanks due to Brexit, then I would simply cut back further. It's true, we don't NEED a lot of the things in SL that cost us money, we just like/enjoy them. Perhaps if our post-Brexit currency value drops enough to restrict your SL passions you can find ways in SL to earn the money to fund them.