imo its a bs excuse to say something like "oh graphics are just as good as they will ever get" or something like that
it's bs because photorealistic graphics have yet to be achieved. sure they have in limited instances, but basically anyone can tell the difference between a videogame and real life. until the two are indistinguishable, real-time graphics have miles to go until they are as good as they should be.
not to say that they are worthless trash or something, graphics have continued to improve since the days of pong and they will no doubt improve more in the years to come. but to say "ok, job's done, there is no need to improve graphics anymore" is frankly short-sighted and myopic. it's perhaps just hard to imagine how specifically graphics should improve, but I believe in the old saying "where there's a will there's a way" and look forward to future developments in real-time graphics technology. there is certainly the necessary money and interest in the right places to achieve great things.
no doubt back in the days of pong that was simply as good as the then current technology allowed for, but
I refuse to believe that in say a decades time real-time graphics will be in the same spot they are in today