We surely reach a more mature phase in the 'mobile apps' market but I believe products will gain in quality in the future and that there are still some opportunities to be seized: - there was a tremendous amount of apps released over the last few years, it is no wonder that competition is getting fierce: products will have to adapt in terms of quality with better and more curated contents. - there is still a lot of room for innovation in re-engagement (http://tomtunguz.com/mobile-reengagement/), deeplinks (www.urx.com) are a very good start