Clearly 4e is the edition least like the others, and with the highest proportion of fans who dislike all other editions, so if you're looking at audience triage in order to turn the ridiculous goal of uniting all the editions into the more feasible goal of uniting most of the editions, then that's the first group you should exclude.
I mean if you look at the discussions in this forum the difference between the opinions of 4e fans and pre-4e fans is as clear as day.
There should be a 4e clone if there isn't already one.
Clearly you have no idea what you're talking about.
OD&D was so limited you couldn't play a non-human character you wanted, you had to play a stereotypical Elf, Dwarf or Halfling. No Halfling Fighter, Elf Ranger or Dwarven Cleric just the same, old straightjacketed stuff dreamt up in some guys' basement smoking funny stuff and reading Tolkein. The base system was so pathetic it could fit in three pamphlets, not even needing real books for its three classes. They clearly aren't advanced enough to be real gamers and should be ignored.
1E is also terrible. I mean, no kits, feats, no real choices outside of a very few classes, you couldn't even play a freakin' first-level Bard until everyone else was at least 10th level and Rangers couldn't wield two weapons properly in the PHB like every other actually advanced edition? And those level limits, what, if I don't want to play a human I can be a thief or a low-level putz? Racists much? And it didn't have a real DMG, just some charts strewn among a bunch of some geek's poetry and prose. And miniatures made with actual lead? Heck, that whole game couldn't come up with a decent acronym for attack number, were they licking those lead miniatures? Those people should be tossed right out.
And what about that so-called "Second Edition", sure, they finally figured out what to call the attack number and straightened out some charts but none of those people could even settle on a setting or three. What, Greyhawk (Western European old hat), Forgotten Realms (The Land of Mary Sues), Dragonlance (Because emo wizards are so awesome), Mystara (someone should have taken a drug test), Birthright (ooo, everyone's a prince), Ravenloft (someone fell asleep watching Nosferatu on late night TV), Dark Sun (from watching too many Mad Max movies or something), Spelljammer (Hey, space pirates can travel to any of those other worlds too if the Neogi and Mind Flayers don't get them like Han Solo played by Errol Flynn) or even Planescape (screw flying, I'll just walk through a couple of doorways to get where I want to go and I'll never get lost while I'm there 'cause it's just a big donut-shaped town). That many worlds is just dumb and can't be properly supported and every class having their own splatbook is just wrong. Those people aren't worth paying attention to.
And 3E the least like the others, what with all those fiddly skills and their minutia. And the 3E/Pathfinder cultists are the ones who post loudest about their dislikes of all things 4E. And what's this Eberron place, heck 2E had about 172 different settings and didn't even bother with that mess. Desert Drow, evil Gold Dragons, flying airships and all that mularky that was never part of what D&D really is. And because of their cult-like drooling over all things Paizo, they are worthless and just bring about the ruination of the game.
It's pretty obvious that if they want to get as many real D&D players together there's only one game they really need to emulate: Trouble because the Pop-o-matic keeps those dirty rotten cheaters from using loaded dice or telling lies about their stats.
