@Riot: I don't think rune changes need to be too drastic! It's the grinds for PAGES that suck.
Related to the latest Riot Plz... Why does a new rune page have to cost as much as a brand new ******* CHAMPION? And often these pages can be for something as small as "AP vs AD" with resistances weighed a bit more.
The actual grinds for runes themselves are less of a pain as the slow purchases give enough slow gratification to keep a player happy. "Gratification"... let me explain... grinding 400 IP for Lethality marks isn't that tough... the 1000IP for a quint? Maaaybe a bit of a grind but still can live through it....
However then comes that big one. #The 6300 IP just for the ability to use those runes.
It really sucks that you have to make this giant grind just to be competitive when the meta changes. So my advice would either be a HEFTY discount on rune pages or outright removing the page grind altogether and have them work like mastery pages where they're already there and you don't have grind to get them.
That said, if you do overhaul the system big-time... don't let people's hours, days, weeks of rune grinds be a reason for not completely overhauling the system and making those grinds irrelevant. I get the train of thought of protecting the purpose of those grinds but this is an issue of game health we're talking about.