Yes, it is possible for the examiner to change his mind, however, it is unlikely since the response from E.Digital did not bring up anything new that he has not seen before.

Personally I think E.Digital did the right thing by not changing the claim, or by creating a new re-written claim. For any newly written claims you cant sue for infringement on devices created before today, and that would really stink. Plus I can almost guarantee that anybody we sue is going to request a re-exam and Markman on any re-written claims.

Let a new examiner look at it after an appeal.