Whilst there probably is some truth in this and to a degree I would agree, I think it's quite harsh. I'm struggling to think of any company in the 25-odd years that I've been gaming which has simply discontinued the old console entirely (model/games/support) once a new model has been launched. The old console has always continued on for another year or two in order to not only allow those left behind to catch up, but allow developers of existing games in production be completed for the platform they were initially designed to be on. I'm sorry, but I don't see what the problem is with this.
For instance, due to other life commitments and a general lack of funds, I have so far been unable to upgrade from the PS3 to the PS4. There are still many people out there without the new console as things stand for whatever personal reason, and to simply 'cut them loose' isn't only unfair on them, but doing this would probably make a number of them buy another console other than the PS4 as a result in silent protest. It's exactly the same story with existing Xbox 360 owners who have not yet had the opportunity to upgrade to the Xbox One.
With all that said and done, I won't staunchly disagree with what has said been above. I've generally been underwhelmed by the quality (graphics wise) in PS4 games given it's a superior machine - although admittedly my spectating has been done via YouTube. My regular readers will know that I do and will always rate gameplay and plot over fancy graphics any day. However there's only been one, possibly two games so far that I've seen that visually look any better to what we've already been used to over the last two or three years.
Not many will probably agree with me on this point, but I feel one of the biggest reasons for this is Sony were perhaps desperate to get the new model onto the market. Given the excellent quality of games at the end of the PS3’s run ('The Last Of Us' immediately comes to mind), it's shown to me that it's full potential still hadn't quite been reached. The lack of PS4 games at launch also makes me think that perhaps the console simply hit the market a year too early. This of course has caused understandable frustration to the 'early adaptors'.
As what's already been said, I feel if support for the PS3 continues on for another two or three years, then I do feel the PS4 is going to start suffering as technology continues to improve. I would be silly to suggest otherwise. As things stand though, barely a year has passed since the PS4's launch and I feel Sony are still well within reason to continue their support for existing PS3 users.
The time will come where the PS4 will shine through. Mark my words. Patience is a virtue…!