Stagnation is happening mainly with AAA multiplats from developers like Ubisoft, Activision and EA. Exclusives are usually very innovative. The advantage of exclusives is that a single game doesn't need to pay for itself, as long as it increases the appeal of the console it can cost more than it earns back in sales. Without exclusives the only big budget games you would get are dumbed down mass-market appealing games like Call of Duty and Assassin's Creed, and games like Gravity Rush or Bayonetta 2 would never exist. Without exclusives Platinum would just instantly go bankrupt, and that's not a world I want to live in.
PC is a great platform for multiplats but, in my opinion, the amount of interesting multiplats being released is very low. I'm looking at the games currently in my backlog and the games I'm interested in purchasing, and without exaggerating about 80-90% of those are exclusive titles.
I can appreciate that people like PC gaming, but I don't understand the sentiment that people would want consoles to perish in favor of everything ending up on Steam and the iOS/App Store, as I believe that would be a major step backwards in terms of innovation in gaming. Imagine Nintendo releasing only Mario and Zelda games because games like Xenoblade don't have big enough mass market appeal. Yikes.