It's a complex issue
On the one hand Apple has demonstrated that tight editorial control over iPhone apps provides benefits to consumers, and given the cost of providing those services they are entitled to require people monetizing their marketplace to pay them for the privilege.
On the other, as Apple's position in mobile computing becomes more dominant they will have to start acting like a responsible monopolist, which will be a huge cultural shift for them and probably won't happen without litigation.
We're not there yet though, iphone is far from a monopoly in the phone market and it's too soon to tell how much of the tablet market they'll take. Anything less than 60% and it will be hard to paint Apple as a monopolist, instead consumers will have two clear choices - a controlled Apple world of tightly integrated devices and apps, and a looser android world.