It's a little sad to see things the way they are. Nintendo has a load of beloved IP, and a generation of developers who would likely love to build for a Nintendo platform. But they've failed to capitalize on either.
Would console sales suffer? I'm not so sure. The market for, say, tablet games may not be the same market that exists for Nintendo DS games or WiiU games.
More than anything, it seems that Nintendo has just decided to do nothing to fix the situation. Even small-scale experiments in expanding their marketplace reach or opening up their platform may potentially encourage investors in their ability to get things back on track again.