Yes.
I thought about this before. Old copies of Tor Browser accumulate over time. Not a big issue in case of Non-Qubes-Whonix. But Qubes-Whonix default TemplateVM root image size is small in comparison.
The user might have customized Tor Browser in Whonix-Workstation TemplateVM. By auto deleting the old folder, data could be lost. I don’t know how to solve this. //cc @marmarek