> Oh, well, sure. Web browsers now are basically application platforms, like

Which is totally at variance with the design principles that produced
HTML in the first place.  I think we are well into the stage of
standardisation, where a new protocol is due for invention that meets
the original design objectives - communication of information in a
way that anyone could author on any device using simple software.
So few people now understand the philosophy behind HTML that they
won't realise they are re-inventing it if they create such a new
protocol.

(This seems to me to be part of the lifecycle of all computer languages
standards - start elegant and focused, hit the popular imagination,
become the must implement language for compiler, etc., vendors,
get standardised, bloat, become indistinguishable in capability and
complexity from any of the other general purpose languages, that
pre-dated it.)