If Pierce had no other prospects, I could see the possibility, but he is now looking to the future as an analyst (which also pays a surprising amount of money).
From the Cs point of view, we are basically starting over - with Smart as our longest tenured player. I don't think anybody would scoff at a light return with PP, but this team is prepared to create its own identity without the need for past personalities.
I am just happy he followed through and did sign with us to retire. If his analyst gig doesn't work out, I am sure the Cs will find a place for him some place within the organization.