I mean, yeah. That's what I think they're doing actually. They're just branding it as "OneD&D" to get ahead of people wanting to call it 5.5e or 6e because they know that edition changes have historically been kind of bad for retaining players. But mostly I think they're focusing on giving players incentives to switch over to their tweaked character classes while doing as little as possible to disrupt things for the DMs (who they must know by now are the ones who end up making the decisions about what does and doesn't get played, since they have to be willing to run it).New compatible rules won't do that, either. They will need to offer other things as incentives, which they can do right now with 5e.
Will they succeed? I think that's the $64K question.