Woah, dude, chill. What FAST6191 said is right: it's all about the bottom line.
Imagine you're a video games company for a second. You want to release a retro game, and you have two choices. You release it to be compatible with original NES and SNES hardware, or you release it for Steam, PlayStation, Xbox, Switch, 3DS.
For the first option, you have to pay a hefty amount on producing cartridges, since chips do cost money, but even to do that, you might need to get a factory to produce the chips especially, unless you can get a third party manufacturer or off-the-shelf parts. Either way, your company is not set up for this, so the initial costs will be substantial.
You also need programmers familiar with the assembly for that particular machine. Sure, there are hobbyists out there who could do it, but usually they do it as a hobby, not a full-time job, and your existing personnel would probably baulk at the idea they need to learn a new way of programming just for this game.
Finally, the end user. There are plenty of systems in the wild, but they are not actively supported, so the majority of users are the kind of people who populate forums like this - people like you and me, basically. It may feel like there are plenty of people like you out there, but trust me: the numbers ain't on our side. Just check out the numbers of viewers on Twitch for modern vs retro games.
Also, most of the core audience would look at your cartridge and think "how much?! I'll just get a ROM instead". I could be wrong about this, but still...
Now, the second route. You make it look just like a SNES or NES game, but get your existing devs to make it in a language they're experts in. You aren't restricted by the limitations of old hardware. You have an install base of anyone with either a PC or modern console - that is, literally everyone. You don't need to get into manufacturing cartridges, especially since your company probably doesn't manufacture anything anyway. The cost to the user is about four to five times less, simply because there's no cartridge. You can sell all over the world via a download, without worrying about postage problems.
Faced with these two options, there really isn't a choice at all. I know you would love to see brand new games made for old consoles on cartridge - I'm sure a lot of us here would like the novelty factor of it. But business is business.
Now Kickstarter, on the other hand...