As a heavy digital card game player, I’ve seen many projects rise and fall.
Every IP in existence from Fable to Elder Scrolls to DOTA can get a card game these days, and in the face of adversity (read: mostly Hearthstone), fail. Others, like Ascension and Eternal, have carved out a nice little niche for themselves, co-existing in harmony.
But Legends of Runeterra is on a different wavelength by virtue of it launching with the full might of Riot Games behind it. I hope it sticks around.
Source: Destructoid Legends of Runeterra could give Hearthstone and Magic: Arena a run for their money