CPU/GPU process is normally discussed as main factor in new gen launch (which it is), but memory process and data-bus developments could also be factors, although I'm less familiar with announced developments there and their 'due date'...?
HBM2, GDDR5X is already mass-market.
GDDR6 is ramping up and will be mass produced this year if it hasn't already. (Couldn't be bothered to check)
So memory tech shouldn't be a hindrance.
memory price is an issue right right now.