I see some alignement from those firms that eventually will disbalance the market from it's current state.
Maybe the only thing that they are not considering is Apple and the fact that their strongest competition, "Vectorworks" + "Archicad"+"Maxon", relies on Apple platform. The only software they actually produce for the Mac is Maya.
Another fact is the implementation of IFC. ?Will it bring it's fruits in the medium term, with two big softwares developers defining the ways of the interoperatibily between a vast group of users?