The most played game in the world seemingly can't keep more than a handful of queues populated?
Team Builder and Ranked 5s were retired with the release of Dynamic Queue because of concerns about low population, then went SoloQ to prevent fragmentation, then went Dominion, Twisted Treeline is still basically a wasteland across the board, and now were looking at the death of Normal Draft.
Meanwhile countless other popular games have tons of full playlists.