The manual trim wheels are not necessarily the only option in that case. If the runaway is due to faulty MCAS commands, the electric trim (operated by the yoke

The manual trim wheels are not necessarily the only option in that case. If the runaway is due to faulty MCAS commands, the electric trim (operated by the yoke switches) is probably still functional, so I believe it is possible that the procedures for handling MCAS failure have been modified, now that Boeing is no longer pretending that MCAS makes no difference. In addition, I believe MCAS itself has been modified. I have not seen a clear description of the changes, but they might include additional redundancy, rejection of improbable data, warnings that there are these problems, warnings whenever MCAS activates, restrictions on how much it can change the trim, and a cutout switch for MCAS that keeps the electric trim functioning. In the worst case, manual retrimming with the wheels is still the last resort. I have seen it suggested, by sources generally considered reliable, that (prior to the Max) the need for the manual trim has been so rare that its use is not part of simulator training for any 737. I do not know if that will change, but if so, it would seem to raise the question of whether pilots of earlier variants also need additional training in its use (I would guess that it is most difficult on the largest and heaviest variants.)