There are obvious advantages to it:
1- There simply is demand for it! As insane as it might seemm
2- You can run old apps and old games alongside with newer stuff
3- You can actually get around the licenses and just get the OS4 classic version running, assuming the card comes out soon (which is probably impossible...

but still, judging by how things are going with the court battle and Amiga Inc.'s complete incompetence in everything so far, chances are this is as far you'll get.
4- You'll probably be able to also run MOS on it

5- Design could build up somehow on the CyberstormPPC, assuming those are the some people that worked on it, so faster design. They also had the CyberstormG4/BlizzardG3 prototypes some time ago, but it's not known how far did those go.