Capello won 2x Serie A (later revoked for Calciopoli, which he benefited from but wasn’t connected to) and La Liga in the 3 years prior to taking the job. Sven was still very hot property when he took the job, personally I’d say Sven did a decent job too to be honest, but he never dealt with the statesman side of the role and it was his downfall. Especially with the life he led, but that is what it is.
I don’t see a single chance that a Tuchel takes the job, in addition to his football being dull and defensive (even compared to Southgate). He’d also falter massively under the press pressure, he succumbed at Chelsea which is childs play in comparison.
Also I would never agree with referring to Roberto Mancini as world class.