Would the introduction of a single (open) gaming platform have positive effects on the gaming industry?   stance: no:
I dunno... the open platform seems extremely weird. Game producer's will, of course, have a much easier time developing games but I don't see the point to buying one box and then having an "Xbox", "Playstation", and "Nintendo" station for it... the only reason those names exist is because they make their own consoles. The three big competitors in this industry would be strapped to one box... making money off of their interfaces? Compared to third-party producers, the three companies very few games so it seems like there would be a substantial loss of profit for the giants.
I want to see the competition, competition is what keeps the hardware advancing and taking everything to next-gen.