It's time for an enterprising group of hams/software engineers to write a replacement...a portable replacement which can run on multiple platforms. Make it Java or Python based, modular and extensible: You install only those features which you need.

Legacy (true TTY) support for RTTY terminals such as the ST6000, ST8000 and anything else with an RS232 port attached.

Standardize the device driver modules which feed the main program itself - in classes of, say: rigs, rotors, TTY, TNC, network and so forth...document the upper level API and let the community at large get to work.

I can write drivers for a few rigs which I have on hand as well as the Timewave DSP599 (native TTY), KAM Plus, KPC3, KPC9612 and Universal M7000 (all in host mode).