Imagine a world with no electricity, infested with dinosaurs and giants. Where would John Cena and you be then? Riding tamed raptors together, hunting for your dinner of giant thigh. --- Wake up and face me. Don't play dead, because maybe one day I will walk away and say "you disappoint me, maybe you're better off this way"
In a world without Cena, a lot of sick little kids wouldn't have gotten really nice Make A Wish visits. I remember reading in Hart's autobiography that Ultimate Warrior made some dying little kid and his family wait for hours before acknowledging them. In fact, he had them moved from the backstage runway area so he didn't have to talk to them until he felt like it.
Say what you will about Cena's affect on the business, but he's brought a lot of joy to kids and families that really need it.