No it doesn't; it's too early to tell. A simile is Wii U. Nintendo fans saw 3 million sales at launch as proof that those of use who said it had limited appeal were wrong. Months later, they still pointed to it being the fastest selling console (over three months) as proof everyone loved Wii U. It was only after a year or so they could finally see that a strong early start isn't indicative of long term performance. A product can start strong and fizzle, or start weak and grow (or start strong and stay strong, or be still born!).
The timeline for consoles is longer than Wii U's first year so the start is a year rather than three months. One year of new consoles selling to the hard-core console fans doesn't prove that the 120+ million more-casual console gamers are going to be buying these machines over the coming 4 years. It might happen, it might not, but there is zero proof.
But the alternatives are starting to offer that experience, or at least have the potential to. When Joe Public can play Uncharted on their Samsung TV streamed over PSNow instead of buying a console, will they still buy a PS4 or will they be content with the streamed service?
That's not a rhetorical question, it's a literal one. We don't know how things will play out in the coming years, but there are lots of challenges to the console market. Taking one year of sales as proof that the console industry is good for another generation is jumping to conclusions IMO. It's only proof that there was a lot of core console gamers interested in new consoles.
Of course it's to early, but i would say the prognosis is very positive, the WII got lots of sales on the input/controller system, but the games didn't follow up, and the sales died. I think it is safe to say that XB1 and PS4 had a great start, thanks among other things to milking the old consoles so much that even these new lesser powerful consoles were able to show a real next step in graphics. But unlike the WII the games count way more, and the best games are yet to come, i am certain that GEN8 will sell so much it would seem foolish not to do the next round.
Streaming games and smudge gaming belongs to another thread imho, i think the threat they pose to real gaming on consoles are very small, the games simply aren't on mobile devices and streaming games have some many issues to overcome.