@ehBeth,
Personally, I think it's a big mistake.
Like a fair proportion of Brit people, I simply switch over whenever Chris Evans is presenting something on radio or TV. He, to me, is the archetypal shouty man, who spends a lot of time on air basically reminding everyone how rich he is, and what a wonderful lifestyle he leads.
I like LeBlanc, and loved his appearance on "old" Top Gear, but that was with the Clarkson team. Clarkson can be a bit of a dick, but he can also be hilariously entertaining. The mix of him with Hammond and May just worked.
I doubt whether LeBlanc will like the shouty man style, and I forsee a pretty quick parting of the ways.
Btw, has anyone mentioned (in detail) LeBlanc's role in "Episodes" on this thread yet? I haven't read through for a while, so forgive me if I'm going over old ground.
He is quite simply brilliant in both series of Episodes, and it is obvious that he loved playing that part. Very highly recommended.