MMA Retirement ≤ WWE Retirement?

I'm a longtime fan of Pro-wrestling. I've watched since I was a child. A good part of my 20's were spent trying to realize my dream of main eventing Wrestlemania, possibly in a career Vs career match. See, I didn't worry about being chosen to loose my career in a pro-wrestling match because all that meant was taking some time off only to return after a few months or maybe a year. Now it appears MMA life imitating WWEs "art" as rumors persist that BJ Penn and Brock Lesnar will be following Jamie Varner our of retirement before the end of the year.