I thoroughly welcome this not happening.
I welcome this. Not from any position of business expertise, or any personal interests, but because a certain level of plurality at the top is essential in my opinion.
Monopolies, duopolies, and cosy little (big) cartels don't serve us great unwashed or our businesses. Competition leads to more innovation and differentiation. If the few biggest players are just Borg-ing up others... Where's the fun in that?
Or am I just an idealistic old-ish curmudgeon?