Featured game modes ftw? maybe

Throughout league we have played many game modes like urf that we HIGHLY enjoyed or at least i did, along with others, but we see them for only a week and they're gone for a very long time. What if....and hear me out......what if we can have one every 2-4 weeks on a cicle or something the recent lose of dominion(rest in pepperonis...kinda) brought this to my attention. Because it diversifies gameplay and surprises you every 2-4 weeks with a "new" way to play(it would probably be the same modes on a cicle) idk it sounds like a good plan to me but im a bronze scrub.

Also why take dominion from custom games?