It would be great to have a cab only profiling feature instead of having to profile the whole amp and then extract the cab from the profile. The process would be much faster and multiple cab profiles at different mic positions could be created in just matter of minutes. In order to do that I guess we would only need a flat power amp to drive the speaker.
I think that right now there is not a lot of people doing this because it is very time consuming. Shortening the process would make it much easier, more accessible and cheaper (in case you need to rent a studio or cabs) for everybody.