No Wayman <iarchivedmywholelife@gmail.com> writes:

> As far as org-capture is concerned, support for transparently 
> upgrading the
> user's templates could easily be added to the 
> `org-capture-upgrade-templates`
> function.
>
> It would just be one more case added to the existing pcase 
> statement and would
> prevent breakage for users.

See the attached patch which adds the mentioned case.
The docstring for `org-capture-upgrade-templates` could be worded 
better/more generally.
I believe we could also do a better job notifying the user when 
they have outdated
capture syntax. Really we should be recording *which* templates 
use outdated syntax
and pointing them to a solution. These are separate issues, 
though.