If we asked a slightly different question - say, a team of players who will be under 30 at the start of the 2018 English season (so the randomness of who retires etc is taken out of it) then the resources look pretty plentiful. The "First XI" is a bit of a top of the head thing, there are lots of either/ors...
Hameed
Lees
Root
Duckett
Bairstow
Burnham
Stokes
Woakes
Rashid
Wood
Jamie Overton
On top of which you have, batting wise:Burns, Westley, Browne, Robson, Gubbins, Bell-Drummond, Northeast, Clarke, Ballance, Hain, Roy, Hales, Vince and Abell.
Foakes, Buttler and Wheater are other options with the gloves.
Crane, Rafiq, Leach are the spinners.
And seamers? Fisher, Willey, Ball, two Currans (though Sam really would need Stokes to be injured), Craig Overton, Archer, Mahmood, Porter...