I suppose the debate is.... I said Marvel films suck up resources and talent that might have been used to make films that (and this is the main criteria) I would rather see. Luka said "Ah, but maybe some of that talent uses some of the resources that they gain to make those films".
But to me the point is not "Does that ever happen?" but more - "Is there a net gain or loss due to the Marvel domination?" - and my gut feeling, which obviously is little more than that, is that overall something being so dominion tends to stifle creativity and diversity (in the old-fashioned sense) and is ultimately, overall, a bad thing. Although I admit it's not as clear cut as one might first think.