Eh, not really. They aren't called star wars 1, star wars 2, star wars 3, etc.
They all have individual names and they are just ordered 1-9 without it being in the title.
Witcher has the number in the actual title (at least the second and third do)
So instead of The Witcher 3: Wild Hunt and then releasing The Witcher 4: ??????, I just think it may be more logical to release it as The Witcher ?????? 1: ??????? or something, just so that it is obvious it's a separate trilogy and storyline.