I really don't think so. People use the old tiny-based avatar all the time. Carnifex converted tervigons, too.
It's not like it's a modeling for advantage thing, it's a lazy thing. Just because GW decided they wanted to sell bigger, more expensive models does not mean I have to go crazy trying to rebase stuff.
Actually, now that I think about, I think I actually stuffed my FW broadside on a smaller (termie) sized scenic base. So, they're all on the same base. But I'm not going to change them out for bigger ones.
When I do scenic bases for my FW Crisis suits maybe I'll put them on a smaller base -- IF they fit.
This all has very little game effect, anyway. Base size for a Broadside essentially never matters, and it matters for a crisis suit only rarely.