What occurred to me was that TG gradually became less a petrol head car show hosted by adults who sometimes acted like little boys, than a show about and hosted by naughty miscreants who rarely acted like adults with cars as sometimes supporting actors. The stunts and gags became not only repetitive but unimaginative, patronising and insulting to my intelligence if they expected me to believe they were just accidents, like Clarkson's Citroen CX caravan "accidentally" going over a cliff - sorry, but we're all smarter than that.
Frankly, I don't care who hosts it, as long as it's primarily about cars that excite me, has the production values we've previously enjoyed, is not an episode of the Three Stooges every week, and doesn't treat me like a child with the attention span of a flea on a hot plate with hyperactivity disorder. Make it adult with the odd dose of silly/funny - you can entertain me at the same time as educating me.
One thing for sure - I won't pay Amazon to watch Clarkson get paid £833,333 per episode on Amazon (Past His) Prime.