Well, before last year I would've said this was a terrible idea.
But now I have faith in Lucasfilm under its new management. And as for Harrison Ford's age, well, depends what kind of SHAPE he's in really. He's not gonna be as quick as he was in 1981, but he's not some senile, decrepit old man with a walker, either.
It COULD still suck, but I'd say it has a better chance of being good now than it did, say, five years ago.