ScuL: he is a good fellow but he will never be able to fill the footsteps left behind.
I think the point is that he isn't going to... they're not naïve enough to think they can.
Evans and whoever else they bring in will take things in a different direction, whilst, CMH will doubtless do what they've been doing on Netflix or wherever.
As a car guy, who's enjoyed new TG, as well as the more car focused older TG, it's great as it'll be like having a dollar each way.
If CE & co suck, I don't have to watch them - if CMH keep doing their thing, I can watch them if I choose (and quite likely I will).
I don't see a down side. Besides, as mentioned earlier - there's always Fifth Gear!