Yeah. AoA and 1610, plus Zombies (which is very difficult to do) and a few one offs like HoM and AoU are the only universes participating that have a good foothold in minimates with figures, but it would never be enough to cover what is needed (or wanted, in 1610's case according to what Zach said last time about it)
Spider-Verse has an easier time doing mutliversal stuff since we already have a bunch of alt universe Spidey's lol.