it really needs to changed if Riot wants the game to ever be truly healthy from a role balance standpoint
I don't agree. I think it's cool that they have a different take on it from other MOBAs. All MOBAs have carries, right (that's the point I was really trying to make there)? For League, it's a class of its own; nothing wrong with that if you are okay with having 1 of that class in every match. We pretty much have that.
Other roles have variety in scaling.
So do marksmen. Lucian is stronger early game than Vayne, but Vayne outscales him hard.
If you give marksmen the variety that, say, fighters or mages have in scaling, you would really shake up the meta. Like, maybe it doesn't even make sense to have marksmen/support in the bot lane anymore.
Lots of players would like that. I get that. But, and I'm speculating here, I think that consistency is part of LoL's advantage over the MOBA competition. People can play off-meta, but you know what the standard is. This is why the game took off in Season 2 after the marksmen/support botlane meta got cemented. The more predictable nature of the game appealed to a more general audience.
It's easy to believe that changing that up would be an intelligent move, from a player perspective. It would really help freshen the experience for those of us that want that. But, from Riot's standpoint, that doesn't make a lot of sense. You risk alienating a lot of players who value that consistency. Why take that risk?
If we actually saw League's playerbase start to decline, I think we'd know it because the balance team would take risks like that to try to get players back. Since they aren't, the safe assumption (imo) is that they are growing at a pace that they are comfortable with, and they are on track.
Again, it's a smart analysis by the people who are making the decision selfishly; I, too, would find the game more interesting with bigger changes. But from a business standpoint, it really doesn't fly. There too much money (and people's jobs) at stake to do something like that in League. I think it's a neat idea that someone should do (if DOTA2 doesn't already, I wouldn't know), but not Riot. Riot has this, and this is good.