Would signatures on petitions persuade Disney?
Probably not. Corporations tend to ignore fan petitions in cases like this because it's too easy to list fake signatures/names/email addresses.
However, letter-writing/e-mail/phone campaigns *can* make a difference.
On a related note, I'm spearheading a "campaign" of sorts at toonzone.net with full staff/admin support in a series of "open letters" addressing the studios/companies sitting on the licensing rights to various animated properties. I was already planning to include the Treasures line.