Brion's point about template link table corruption
is a good one. That
would indeed cause problems.
Yes, but I wonder: How different would that be from the current
situation? I can say something like
{{It is {{#time:s}}}}
which tries to include a template – which one is considered on render,
but the templatelinks table is updated only on save. So that after the
first action=purge, you have the same kind of corruption. (See
[[testwiki:Parser functions vs linktables]].)
(Agreed, it is not that big of problem currently, because the use
cases for this are rare, while the {{USERLANG}} would IMHO spread very
quickly, esp. on Commons.)
-- [[cs:User:Mormegil | Petr Kadlec]]