Also, having two or more "strong" alt-coins provides competition. With three strong dev-teams there's bound to be a lot more cool innovative ideas than just one "super-strong" dev-team spinning away on a single track.
I agree in theory however that wasn't his point however with the exception of NMC and PPC there hasn't been any real innovation. His point was about mining being profitable. That implies by simply adding a continual supply of new coins/chains you could ensure all mining is always profitable. Like I said just make a million of then and end global poverty.