I'm not really sure what point you're trying to make, the BBC are paying an enormous amount of money to have 'Top Gear' on at 8pm, they are, no doubt, also paying an enormous amount to show live football at 8pm, why?, TV companies make a great fuss about prime time viewing figures, so why show two highly expensive prime time shows against each other?
Because they feel that there's a big enough audience for both, whether live or via catch up. If I were at home, I'd probably watch the football, knowing that I can record TG and watch it at any time (assuming that there's nothing on one of the other channels that Mrs EM2 would insist on watching

).
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Well I would argue that it isn't really Hislop or Merton who really make HIGNFY work. It's the combination between getting a good guest presenter in (some weeks are funnier than others), and the show being not afraid to take the p*** out of anything and everything.
HIGNFY didn't have guest presenters until Angus Deayton became embroiled in a sex and drugs scandal. It was him, Merton and Hislop.
If you believe that Evans will come good eventually then that's entirely up to you. At the moment it's a case of how long before the Beeb can it. Not sure the bosses will be willing to fund the enormous filming budget with such poor ratings for long! It's not just about getting UK audience figures, it's about selling the rights around the world and all the merchandising. With the show getting such a pasting on social media and mainstream media I can't imagine there will be masses of demand for either at the moment.
I have no issue with Evans, it's not a question of him 'coming good', he IS good (and this is from someone that HATED him on every other TV show that he's done). He's an experienced broadcaster, he's got a lot of car knowledge, and he reviews cars for the Mail on Sunday (or did, at least. I'm not sure if he still has that gig).
So he shouts a bit? So did Jeremy Clarkson.
So he's a bit stilted in the studio? So was Richard Hammond.
If you don't like it, don't watch it, and pay £80 for Amazon Prime.