Hi John,
Strictly speaking, yes, I'd be cautious about making large bets that current_date() would continue to work. However, engineering doesn't seem to be placing much priority on fixing the issue.
It also appears that support for non-deterministic user defined functions has already been implemented (with the addition of some syntax explicitly declaring the function to be non-deterministic) for the next major release, though I can't officially guarantee that the feature will become available.
My best guess is that current_date() will continue to be usable as-is at least until the new feature comes out.
-bret