I hope Kane just sorta gives up on forcing Cena to ~embrace the hate~ some time between now and Wrestlemania without actually achieving anything. Just so he can add another notch to his hilariously terrible characterisation/backstory. Have him drop all his resentment/anger without any questions asked.
Like, in a few weeks just have him realise that this feud has a shelf life. “Oh… You mean you’re already facing Dwayne at ‘Mania? Damn. I guess I should stop bugging you then. My bad.”
And then they’ll never mention it again and Kane won’t want to murder Cena or his friends anymore and nobody will care.