I think trying to put out a version of D&D that only goes to level 10 would be a mistake. One of those, "Give them what they want, and they will hate it." situations. Like the TV series that have a romantic "Will they? Won't they?" situation. Everyone says they want to see them get together, but as soon as they do, the show's ratings tank.
Even if people don't play to 20th level, they want to see it. There needs to be something that they can look at and dream of attaining, but not actually reach. They want to imagine how cool it would be to be a 20th level Paladin or Wizard. If they get everything they want at 10th level, then after a couple of campaigns they will be done. There will be nothing left to strive for.
I don't wholly disagree, except this attitude continues the romanticism of a glorious 1-20 campaign that lasts 3-4 years and everyone is deeply invested in their characters and it's forever memorable and epic and... A romantic fantasy that many players will never see.
I friggin hate the romanticism of the grand story campaign, because it's such a big yoke to put around the GM's neck... And honestly as the GM, I fall for the fantasy all the time as well. Start a game at level 1, or 3, or whatever, play it til you're good, and then peace out at 10! You had some good times, go make some new ones.
Why can't the game be 1-10? What about 1-12? Why 1-20, because it's been 1-20 for some decades? Ax some sacred cows!
But then I'm pulled back to reality. WotC bought DnD, Hasbro bought WotC, and they expect a return on their investment. They bought those sacred cows: six stats, saving throws, fighters, fireballs... The game is designed with the assumption that these are going to be there, and later the mechanics are designed for them- not the other way around.
So yeah, 1-20. It's a weight on those designing the game, they need to account for levels that don't really matter as much, but it's a core part of DnD that owners are likely not going to want to ditch.