What I worry about with 10 bans.
100% ban rate
100% ban rate
100% ban rate
100% ban rate
..........
100% ban rate
100% ban rate
100% ban rate
100% ban rate
..........
God forbid people learn counters to champions rather than just being able to ban them 100%.
That is the only thing that more bans will achieve.
If they're banned all day everyday, wouldn't that tell Riot something?
Like 'these are too strong or not fun to play against!'?
If you're seriously worried that there would be a 100% banrate for annoying/problem champions, then you don't know what purpose bans serve in yoloQ

And we shall see what people will bring out :P