Requiring the player to complete a game in one sitting isn't done because it was recognized that people don't always have the time for that. When a game takes that long to get to a meaningful closure (saving your progress or winning the game) I'm often reluctant to play at all because it means when something interrupts me I lose all my progress. Plus trudging through three levels I can already beat blindfolded to work on the fourth which is giving me trouble is annoying.
Hell, even on the NES many games had ways to resume from where you left of though it often came in the form of passwords.
And what's your obsession with retro anyway, why should a game be restricted to the old ways so much? Why can't it make use of all the advances since back then? Going 2d does not require turning your game into a big anachronism. You're just clinging to the past where you believe games were magically better than today. Go get Bangai-O Spirits or really any good DS game and shut up. Portability is a virtue, putting a game on the TV when it can be put on a system you can take anywhere is pointless and counterproductive.
Even if your game gets made, would you really buy it? Knowing you I'd expect you to just find some nitpicky reason why it shouldn't count and then not buy it, complaining to no end that your game doesn't get made. Who'd want to make it? If you had a girlfriend who's a whiny bitch and forbids you from having any friends besides her, would you keep her or would you just dump her and look for someone who doesn't ruin your whole life with her demands? Who'd want to make a game for a whiny little bitch on a forum that's always grasping for new excuses why your products don't cut it when there's millions upon millions that won't whine, that won't complain the game is not the exact thing they expected, that might even be HAPPY with it?
What you want is not a game, what you want is your childhood back. Go bother a biologist or something, videogames don't do surgery.