See, now here's the thing.
Udyr has had ONE patch where he's stronger and pretty-much a permaban; This one.
Do you know how long it's been since he's been so strong? When Innervating Locket was one thing ( WAYYYYYYY BACK IN SEASON 1 ) and when Feral Flares was around.
Some champions haven't been seen as strong in a long time.
Urgot comes to mind, only really being seen in mid as LCS fans follow it immensely.
Some champions still have issues TO THIS DAY that aren't being addressed because well. They aren't dedicated fanbase champions, a good example is Urgot or Yorick. Underplayed by a whole lot, but being mained by few.
I have issues with my Taric E fizzling out, but will that stop them? Nope. He won't get any fix or skins until he's released as a rework.
Malz still has an issue because his recall on Snow Day is bugged, but will that change? Nope.
Riot has MUCH bigger problems to be dealt with.
Udyr saw LCS play the other night for the first time in a long while, and I think he won. Do you know why? Runic Echos.
Rammus saw LCK plays the other night because hey. Triple AD and it works. Not to mention that Naut Q connecting after Poppy ult'd him away.
Everything that lands on the PBE or is changed without notice comes from competitive players and very high elo games.
Adding a subscription to League is something that I'd be against. As someone who is unemployed and is making VERY LITTLE writing poetry for others, I can't afford to subscribe to League of Legends JUST so people can listen to me.
Money is EXTREMELY tight right now. Half the people I know have lists of skins they'll buy when they have extra money laying around.
Take into account Summer is coming and that means people will be blowing cold air and that's more on the electric bills, it would hurt Riot more then benefit to be quite fair.