WE ALL AGREE: From 1989 onward, all new PCE products (CoreGrafx, DUO, SuperCD, LT...and GT, too?) should have been equivalent to SuperGrafx hardware.
An aggressive "upgrade your old PCE" campaign + coupons + candy would sweeten the deal.
Altered Beast SGX would be launch title.
Cross-promotions between SuperGrafx, Capcom/Konami shmups and popular confectioners would be paramount to success.
For example, imagine a Reese's SuperGrafx campaign:
A series of 7 collectable Gradius/Parodius/Gyruss SGX stickers, exclusively found in Reese's products.
A series of 9 collectable 1941/Legendary Wings SGX stickers, exclusively found in Reese's products.
A series of 15 collectable Strider/Altered Beast SGX stickers, exclusively found in Reese's products!
The SGX juggernaut would have been unstoppable.