I wouldn't say critical. I'd say both are at risk of going too far and need to move on, but there are plenty of people who can fill the void if given the chance. The future ones you mentioned look ok to me, perhaps a few more from both camps though, it the 'past peak' ones that I'm not so sure of.
For WWE, I agree with 'Taker, Michaels and Flair, Flair being about 10 years ago. But Cena and HHH? Cena no way in my view, he's going to get better with experience, you can see he's improved a lot in the last few years in my view. Regarding HHH I'd say he's in his prime, while obviously not a guy for the long term future, he is still one of the best in the world today.
For TNA, Nash and Hall are the same as flair, Sting is also agreed with. But Cage, like Cena is still going to get better in my view. I think he has a bit of pressure on him with the fact that he's one of the big names in my view. As for Angle, I'd say he's also still very, very good on his day. It's just that his days of being past his peak could be very soon as they depend on his all too brittle body.
