Alright, so we'll do the following:
For v2.8, the RPC support for Revit will stay as it is.
We will try to improve the experience and compatibility starting with 2.9 but will take care that it won't be compatibility breaking.
Thank you Thomas, I think this should help us with the transition. I recognize Archvision's content & software are buggy and have lagged behind the industry for years now, but they were the first in Revit, so there are some entrenched workflows that will need some time to adjust.