I just realized something

you... you dense mutha flumpa! Excellent theory, but isn't space godzilla's origin explained twice or am I just imaginining? 

There was a little more too it than that, and well, Godzilla himself would become the new Space Godzilla.

The_Godzilla, in the movie Godzilla vs Spacegodzilla, they explain that either the cells got into space by being carried by Mothra when she went to keep her promise to Battra and or by Biollente after her battle with Godzilla.

Kage432, That could also happen. Godzilla could also become an even more powerful being than Spacegodzilla since he is a whole creature and Spacegodzilla was made when just a few Godzilla cells entered a Black Hole. Hmm...Entire Godzilla + Black Hole= *Gasp!* SUPER GODZILLA!

im a showa purist, but if we could see space godzilla as a future villain i would definetly love that :) 

I always wished Toho just went crazy with the Dimension Tide weapon. Megaguirus and her kin clearly came from an alternate Earth where they exist. It would've been cool to expand on this idea and the Dimension Tide open up portals to multiple Earth's where the 54, Showa, Heisei and Godzilla 2000 Godzillas meet in the same universe as the vs. Megaguirus Godzilla.