Have to wonder if it is too late. Everyone I knew still using twitpic switched to using twitter for images following the issues and announcement a couple weeks ago[1]. Cannot think of a reason they would switch back. What is the value proposition?
[1] Prime example is the bostonfire twitter account. They were using twitpic, seemingly out of stagnancy in not changing services. When they couldn't post pictures on September 4, they switched to posting pictures directly to twitter. Cannot think of a reason to switch back.