I'd have to disagree with you there. The pressure comes from the consumers. Write a crap app, get no sales or downloads.
The biggest problem I see write now in the market, for developers, is that there are so many free apps, outside of a few games and a handful of very complex, unique apps, people just go with the free versions. It's good for users, to an extent, but since hardly anybody pays for apps, commercial devs aren't really motivated to jump in there. So, quality commercial development suffers...at the moment.