What other options does the Navy have for a new carrier-based EW
aircraft?

The F-14's and S-3's aren't going to be around much longer. The
EA-6B's are old and getting older.

The JSF wouldn't be available in an EW version for a LONG time.
U(C)AV's won't be ready for a mission
like this for an even LONGER time.

It seems like an F/A-18-based solution is the only option left, unless
they want to rely on land-based
aircraft (EP-8?) for EW support.

Does the Navy have any better options than the Growler?