In about a century it'll be quite a bit smaller than it is now, meaning that 13 hours it takes to drive the Nether- I mean Holland would become... I'm guessing 10 hours (I have no idea how to calculate stuff like this myself, so please downvote this comment if I'm too far away from the correct answer)
If I managed to get Belgian citizenship right before that happens, will it get immediately invalidated and replaced with a Dutch citizenship? Or will I get to have both at the same time?