I read the Grantland piece. I liked the stuff on Letterman but I thought Simmons was overly harsh towards Leno with his digs. Wasn't necessary at all.
I was never a big fan of Letterman but I feel a bit old/nostalgic with him retiring. Late Night as I've always known it is over. Now with Letterman and Leno gone, late night is forever changed. It won't be the same. I don't really know what to compare it to but I feel like a new era has dawned, I am officially getting old, and I can now say "back in my day..." I won't watch the new stuff because being "old" now, things were always better in my days.