More Bans!
I honestly think that since there's well over 100 champions, and that the number of champions is going to constantly increase, that there should be 2 bans per player. There's just way too many champions for how little the ban list can be. I think it'd force people to stop playing the same 15 champions and try something new and spice up the meta a little bit. Instead of only being able to ban one counter per lane, you could do two. Besides, you wouldn't be able to ban all the cheap champions, but enough to make the lesser played champions more viable.
Done!