Actually Steam often releases several new indie games per week. This was a busy release week that included SPAZ, EDGE, Hacker Evolution Duality (a sequel), Bastion, From Dust, and some complete unknown called Avadon. Plus a few DLCs for already-published indie games were released this week as well.
Hype doesn't last long on Steam. If a new game has weaknesses, regardless of its genre, the player community will pick it apart pretty fast. Bastion has been extremely well-received, whereas From Dust has been pretty thoroughly trashed since its release due to its very short length, limited gameplay options and draconian Ubisoft DRM (something the publisher fibbed about in pre-release promos). Art style is nice, and it may get you a sales boost on release day, but if the rest of the game is poor, good luck trying to pitch your next title!
Steam represents a conflagration of pretty much every gaming genre there is on the PC and Mac platforms, so a publisher shouldn't be discouraged by the 14-year-old FPS addicts criticizing old-school RPGs, just think of it as their loss. There is a segment of the Steam community which has been clamoring for more old-school RPGs, the Infinity Engine titles in particular (even thought they're all available on GOG), so this could prove to be a very successful move.