Here's a bloke with a Ferrari badge for a profile pic (and a short memory, perhaps) asking a very interesting statement.
FIA will "let" a team dominate as long as that team is able to dominate, given the same rules apply to all. Or maybe you would like them to tailor a set of rules specifically for Mercedes to abide by, so that your favorite team can catch up? Would you really ask the same question if it was that team dominating? Are you losing interest in F1 by any chance?
If not, props to you. It means that you're interested in the sport.