This thread is not for arguing if their should or should not be compatibility between the two game's miniatures. That has been done to death.
This thread is to better explore what people may want from IA miniature compatibility.
One thing clear to me is that Legion has a much tighter scope of subject matter then IA. There are lots of miniatures in IA that naturally have no place in Legion and should not be brought over. But plenty of models have great crossover potential or are new poses of old IA units.
There are also figures that I would describe as being nearly compatible but not worth creating their own unique unit profiles for. for example IA exclusive hero figures could be brought into legion with an alternate art version of an existing unit or upgrade card. Biv Bohdric could just be a heavy weapon attachment for a rebel squad. this would make me very happy as I could include these characters I already like and have painted and it would be easy for FFG to do. this option also avoids giving IA players unique units that would not be available to exclusively legion players.
The main thing standing in the way of proxying extra units with AI figures are three key components. Unit/upgrade cards, activation tokens, vehicle bases. I think FFG could sell a conversion kit or include a few extra cards in the base set of legion.
Nothing less than being able to use IA stuff in official legion events will satisfy me. and I would like FFG to say something about any plans of compatibility sooner rather than later. a "we don't know yet" would be fine to me.
After looking at my IA figures the scale creep in IA puts legion well within that curve. Dengar is over 37MM tall!