One of my pet peeves is when people talk about a certain game, or game design idea and flatly declare that it won't work because of some obvious technical or game design issue. Consider Dust 514 for example. Suzina over at Kill Ten Rats declares that because Planetside wasn't designed very well Dust 514 is going to fall into the same trap.
To which I simply ask, "why?" Why can't the progression be horizontal, allowing you to use different types of weapons, and giving you more options. Why can't players of similar progression levels be automatically matched against each other so that whatever vertical progression there is will be mostly irrelevant anyway? Oh wait, the people over at Hi-Rez studios have already come up with those solutions for Global Agenda. Who is to say that CCP won't come up with even better ways to meld the FPS and MMO worlds?
Again, this isn't to say that the developers will do a good job and avoid the many obvious and subtle pitsfalls of their idea. But to declare the idea not fun because another game didn't pull it off seems silly.