I don't get this, the World Cup final is on 19 th July, so if England get to it, then it'd be late July/early August before we'd even stand a chance of getting him in, and quite possible not at all given the clammer they'll be for him to stay on, and is he just misses out then there is every chance Tuchel himself might want anpther shot at it at the Euros.
Plus we've already interviewed Tuchcel for the job before, so there was something someone didn't like as he was a far easier and safer option than Amorim ever was.
But even if he did come it'll affect pre season, summer window, etc.
Just get someone who is available.