While I agree that Blizz 1 and Blizz 3 have different enough purposes to justify leaving them as separate skills, I would suggest having Blizz 1 changed into an instant cast, at least by the time you get Blizz 3. Perhaps as a replacement for Scathe altogether.

Quote Originally Posted by Gruntler View Post
Blizzard 2 is still used as filler before Freeze.
Okay...?

That doesn't disqualify the suggestion in the OP, for Blizz2 to upgrade into Freeze at the appropriate level.