The more I think about it, the more I'm off the view that this is the right move for Joe Root (and by extension, England)
I genuinely don't think that Root's playing style makes him suited to batting in the top 3 (not saying that he wouldn't score runs there) - he doesn't leave well and routinely fishes outside off stump. In an ideal world, he comes in with England 100/2 but even if he's coming in at 40/2 with England having played 15 overs, he's still far more likely to score runs at 4 vs 3 and there is a large enough sample size over his career to see that borne out. It simply makes no sense to cut his returns when he's the only reliable bat in the side.
As far as Ollie Pope is concerned, it's not like he was scoring runs at 5 or 6, so I think the carrot and stick approach is a smart move. Batting at 3 is a privilege and its certainly better than being out of the side all together. At 24, he has the opportunity to learn the skills needed to succeed in that position. He may very well fail, and as I've noted before, he clearly needs to improve his judgement outside off stump, but if he is as talented as he is supposed to be, then he should also be able to figure out a way to make it work much like Ricky Ponting made the step up in 2001.
I would have picked Harry Brook to bat at 5 and dropped Foakes. That said, I suspect that this series will end up as a referendum on Bairstow/Foakes and we'll end up with Brook regardless.