Do I believe that an SFB-based game from Taldren could be a success? Absolutely - one needs only look at SFC, SFC2, and SFC:OP to see that. Add the things that people have been clamoring for re: GaW (properly) and the Dyna, make it relatively stable, and it is a guarranteed hit.
Could it be a success without Trek (even if it were moddable to be Trek-based)? Maybe.
The tricks are in:
1) Finding a way to market the game without Trek.
2) Financing development. Since Taldren does not (to my knowledge) own the code for the SFC series, the relevant parts would have to be rewritten from scratch. Even doing GaW using the SFC code as a base would take time - and doing it from scratch would take more. I don't know what Taldren's monthly expenses are, but we are likely looking at $1-2 million for development costs - and that money has to come from somewhere.
Does SFC have any really wealthy fans willing to bankroll development of GaW?