PSA: Runes are planned to be reworked in 2017

So you can all stop spamming the boards with requests to drop the rune page cost or change the price of runes again. For all we know, runes might turn into a new form of masteries for stat improvements.

Riot hasn't said anything about what they're actually going to do, but you can rest assured that asking for changes to the rune prices right now is useless.