I won't watch it. Thought he was already too old for the character in Crystal Skulls. Indy was someone you could idolize. Good looking, educated/smart, powerful, goes on exciting adventures, gets the beautiful women... I don't idolize old age. How is he gonna fight big men a third his age? Or will they just not engage him anymore?
What about a new actor? I think the best option would be for an unknown to play the younger Indy again in the 1930s. Disney would thus have their very own Bond series.