What do you base your guess on?My guess is that YMTC probably has enough equipment to open their new plant and ramp up to a certain amount. Losing servicing will hurt in short term, but they probably have enough equipment stocked up and installed already to open up their new fab and expand to a certain point. Beyond that, they need to see if they can find domestic or Japanese replacements.
Just to continue operating existing fabs requires tons of spare parts. Given that each machine can contain 100,000s components it is a daunting challenge to stock up for all possible contingencies.