It will be like the PS4 Pro, something to capitalise on hardcore customers and that is it.
However, most games nowadays can't even take full advantage of PS 5 and XBox Series X, so it is quite questionable what they will do with next generation.
Switch might be oldie hardware, however it clearly shows how well a console can sell when more attention is given to gameplay than polygons per second.
But for their hardware engineers they’re likely done and moved on.