Buttler at eight is wasted.
These are good players, who have yet to develop know how at Test level. Chucking them all out and starting again is frankly ridiculous. What would happen? Immediate scores of 600 and wins in 2 1/2 days. How many England players in this side have played more than 20 games? It makes perfect sense to try and grow a team from the, ahem, ashes of defeat. The best examples I can think of are Nasser's England. They lost a bit, but stuck with some new guys who weren't great straight away, they played negative, negative cricket, and from that came the spine of the 2003-2005 team, which was fantastic.
Instant change, for instant gratification won't happen. Evolve, tweak and gain experience. Don't throw the baby out with the bath water.