I mean, that's part of why I preferred the Sega & NEC ecosystems in the 16-bit era, and why I preferred the 3DO later, but never bought the full console (I did have the 3DO Blaster). With a Genesis (not a Nomad), you could use the Power Base Converter to play SMS games, plus if you wanted, there were the CD & 32x setups as well. If Sega had looked at the CD & 32x the way they did the Mark 2 & Mark 3/SMS, and hadn't been so damn beholden to Yuji Naka, it would have been much better. Then again, if they had done the SG-1000 / SC-3000 thing with the Genesis, we could have had another PowerPC based OS in the world.
Plus, the SNES was initially planned with backwards compatibility, but they ripped it out late in development. So, why should I give them money? It's not like Ninja Gaiden Trilogy plays so much better than the NES carts.