In fact, I would much rather Cena just flat-out retain cleanly after a good match than I would see Punk win the title and either go back on his word or somehow be forced to stay. And CM Punk is my favorite wrestler.
Punk LOSING and then deciding to stay would be acceptable.
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Thank you, Eddie Guerrero.
http://i.neoseeker.com/n/2/nintendo_quality_seal.jpg