We have moved on
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The 2014 Royal Rumble not only saw the last match of CM Punk, but also the first main-show match of (Alexander) Rusev.
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Rusev was just the start, as, over the 4 years that have passed, more and more stars have come from the company's developmental brand, with the majority of champions currently in WWE competing in NXT at some point in their life.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
If Punk was to return, he wouldn't be a young man. Similarly, he wouldn't be the scrappy underdog who is wanting to establish himself. The fans have simply moved on from Punk.
To Daniel Bryan, to Kevin Owens, to Johnny Gargano, to Asuka. Fans just don't care about Punk like they used to.
Edited by Vikshith R