Southgate was a very nice bloke and he did very well initially. He installed a little confidence and a good attitude, especially in the "waistcoat" years. BUT at the end of the day, he doesn't have the tactics and the strategy of a top class manager. He just doesn't. He would never ever be a manager of top English club and Real Madrid would not ever want him as a coach. Southgate simply doesn't have a tactical footballing brain. No game plan of any note. No footballing style at all - nice waistcoat though. This is the truth. Sure, give him a knighthood and an award designated for the english and their mediocrity. Perfect.
Poch. Poch has tactics. Those players better be fit. Poch's approach is not a good fit for tournament football.
Klopp. His football would work very well in a tournament. But he simply doesn't want the job.
Lampard and/or Gerrard. Enthusiasm they have in abundance, but no, they are not proven managers in any way.
Howe. No. Just no.
Potter. He would make us the most boring team in the world. Great players reduced to excessive tediousness.
Lee Carsley. Not even mentioned. But he actually won the U21 Euros - against Spain. Lee knows the young up and coming players (many of the Chelsea lads).
Tuchel. A winner. A successful manager. He needs to be more flexible, but he has ideas and plans on how to win games and implements those ideas.