Southgate's work really starts after this World Cup. He wasn't supposed to take on this tournament (Sam Allerdyce was). Southgate's job is to oversee the integration of the next generation, the fruits of the recently successful World Cup and Euro youth sides England have had.
The likes of Pickford, Ali, Loftus-Cheek, Rashford, Kane, and Sterling are all <=24 and are sure to be with us in 2020. Dier and Stones we’ll have to see, I cannot make my mind up about them, particularly Stones who scares the hell out of me at times.
Either way we have a real opportunity over the next 4 or so years. Please let’s not throw it away by sticking with the current serviceable but unspectacular late 20s/30 crop of Jordan Henderson, Danny Rose, Gary Cahil, Phil Jones, Fabian Delph, Danny Welbeck etc for too long. Before long in must come some of those lads who stormed the youth scene in 2017. Including Lewis Cook of course.