I do really love the arranged Final Fight music on Sega CD, and I'm pleased with how it looks on that system. I don't think the Turbo would have added much more to FF than the SNES. My vote is definitely for a serious "Arcade Perfect" 4 player TMNT. The 9 year old me is just going crazy thinking about it.
Would the USA really have rallied around the Duo if Konami made these ports? I don't know. I feel like the damage that had been dealt early in the 16-Bit war would prove too costly. The multi-platform games that support a console after you purchase it for a system seller like Rondo, Contra, or TMNT don't exist on Turbo. It's how today's Wii-U has to deal. None of the bros buy it for a game like Smash and stick around BC Madden and COD are there too. It becomes niche, and I think Turbo would have unfortunately stayed that way, even though I wanted so badly for people to love it when I was a kid.