Some of the franchise’s players have been understandably unhappy with the situation, but on the other hand there’s not much that Rockstar can do to keep everyone satisfied if they really are approaching the physical limits of the consoles.
It was commendable that they managed to bring the game to these consoles in the first place, as it looks spectacular for a game running on such old hardware, and owners of the Xbox 360 and PS3 were actually generally surprised that they got to play the game on their machines.
So with that in mind, it was still great that Rockstar even managed to keep the game updated for so long on those platforms. It’s better for the studio to focus on developing new content instead of stopping development on the title just so everyone can be kept on the same page. Eventually, some players will be left behind but that’s the way progress works in the gaming world.