Can We Finally Have %Base Mana/Health Regeneration Runes Like With Items?

This has bothered me for a long time. When regeneration was reworked into %base mana/HP regeneration instead of flat values, it really helped a lot with making it a consistently good stat throughout all stages of the game. Why hasn't this done with runes aswell? It'd maybe even make them worth taking, because right now they pretty much aren't since theyreally fall off lategame.