True, but what if modules and settings have support for multiple versions/editions? When everything is electronic, having “dual rules” is possibl, though not as cheap as single rules.If they didn't make everything that was published compatible with both versions, they'd end up splintering their market. It's likely to happen anyhow as some people stick with 5e or migrate to other games, but doing it intentionally seems like it would end badly for WotC. I also wonder if there's room for a Basic game on the market that would function as its own game and not a funnel pushing players into an Advanced edition.
So, yeah, they almost certainly won’t do this.