My understanding was that this was the original plan for XHTML. Keep HTML 4.x around as a "legacy standard" for old content, make new developments in a new language with an architecture more suited for modern use cases.
Of course this would have required browser vendors to support two languages at the same time for a sufficiently long transition period, which was apparently too much to demand.
Of course this would have required browser vendors to support two languages at the same time for a sufficiently long transition period, which was apparently too much to demand.