They probably could, but didn't because they were already top flashcart on the market and in the end all they're after is your money.Recalling that the Supercard team couldn't even update their own SNES emulator I doubt they could provide anything what Gateway doesn't already provide (except maybe a flashcart that doesn't brick your 3DS). I predict their flashcart will be exploit based like Gateway and supports 4.X - 9.2 only.
We just got lucky that some persistent fellows here got a hold of the code and some talented programmers decided to improve them.