Why would there be? Apple has given notice in advance and hasn’t stated unequivocally that 32-bit support will be gone in macOS 10.14 (just not “without compromises”). Rosetta was there to speed up the transition to Intel CPUs when they made the switch.
macOS has 64-bit support for well over a decade now. Software that is still not available in 64-bit will either never be updated, in which case there is no point to a transitional arrangement, or will be converted in the foreseeable future.