What the England team needs now and has needed for the last 15 years is a coach with a clear strategy. The new manager needs to pick a system that suits the players and then decide on the best players for that system. They need to forget about trying to fit everyone in, you're never gonna fit 5 in form strikers into a team.
For example, I could decide to base the team on the most naturally talented attacking players we have: Oxlade-Chamberlain, Sturridge and Sterling imo. Put Wilshere at number 10 to release them and stitch them together and then have Henderson, who is a workhorse, and Dier to protect the defence to complete the midfield three. This is a possession based system where Ox would have freedom to come inside to add an extra body to midfield for control while Sterling is told to hug the line to give balance to the shape.
Or you could decide our players are too shit and Wilshere is a shit no. 10 and they're all injury problems on legs and we need to just accept we're a team with little talent. But we do have flying full-backs such as Walker/Clyne/Rose who don't know how to defend so why not use a 5-3-2 with Smalling, Cahill and Stones in defence. Stones can be the ball playing CB from the back and fire balls up to Kane and Rashford. Alli and Henderson to support box to box and feed on knocks downs while Dier anchors the midfield.
Whoever the new coach is, they need to break hearts and stop trying to fit Kane, Sturridge, Vardy, Sterling, Rooney, Alli and Wilshere into the same team. They need to decide what system suits the squad and drop the players that don't suit the system.
Maybe it's because I'm a Liverpool fan but I'll claim that Clyne is one of the most consistent RB in the league and rarely makes mistakes in defence. Yes, he isn;t the most adventurous in attack but the last thing you need is to leave your defence exposed when your CB and GK are not very good.
I'm also astonished that Henderson was not a certain starter for England and he take so many stick in that game vs Slovakia where imo he is one of the better players on the pitch. Just keep him away from set-pieces. I know I laughed at England for taking him earlier but that was when he was virtually injured for half the season (you can see him starting to tire around the 60 minute mark).
Since England don't have quality wingers, they should just quit trying to play 4-2-3-1 and play the diamond which allows them to fit Vardy / Sturridge / Kane / Rashford / whoever into the team (this also allows them to play Hendo at the right side of midfield, his natural role). Don't shoehorn players into the team because he plays for a certain club (so no more Rooney, Wilshire, etc.) but pick players who can do the job in a team. For example, in the early 2000s, England tried to build a team around Michael Owen so they pick Heskey who compliments him as well as players like Gerrard and Beckham who can deliver balls for him to chase. If the set-up doesn't fit certain players (the Gerrard-Lampard midfield, anyone?), just change it instead of trying to do the same thing again and again.