That really depends on sales if we had another gen where a console sold like PS2 +PC devs would be alright .
Truth is IMO the industry would be better off with one console plus PC the only problem is the one maker might cheap out on hardware or risk some sort of bullshit .
Truth is you are wrong as fuck. First, we will never have generation big as PS2 generation was. There's PC, mobile and tablets competing for people's free time.
Second, Nintendo and MS are much stronger imo on their own than in PS2 gen, especially MS who goes after same crowd that Sony does. That means more variety for the sales too.
Third, higher dev costs mean that 3rd party exclusives are pretty much dead unless strongly moneyhatted. This means there will be no "go to-console" like PS2 was, probably ever again.
PS2+PC kind of sales wouldn't be enough today to support game industry. Actually, it would be a disaster. For comparison, last gen there was X360+PS3+PC who each had strong sales and good software sales and even that wasn't enough to keep studios or some publishers afloat.
Since PS2 days, dev costs today are about ten times as high. So do you think you can up your game sales ten times larger? Give me a list of over 10 million selling PS3 games for comparison.
Also, single console industry sounds like fucking disaster in the making. Competition is what drives this industry forward, and competition is good for the consumer.