I think there could be a way to placate some of those people who beg for some kind of Super Godzilla or Bagan like a limited run vinyl from one of the retro companies (which are ALWAYS really small runs anyway). But going the Monsterarts route is a really bad idea. It's a really expensive line to develop for.
Heh if someone had some real ambition they'd create a 3rd party company and do monsterarts styled figures of them and call them something else and change up their design. Call them Overdemon and Supersaurus (like the Transformers community does), but alas Bagan's fanboys have neither the ambition or brains to do something like that.
I really got nothing against Bagan or Supergodzilla themselves (I think Elephant Bagan is a much cooler, Lovecraftian concept really), but damn it the cult pretty much does more damage to their own image, and something like this can ruin the image of the fandom overall even further.
As I said before, even if a Supergodzilla or Bagan got announced, that little cult of theirs has the potential to torpedo their own release knowing the nature of that part of the fandom.