I presume we are going to sell of the 24 C-130 J's we have then ?
Logically, yes.
We don't need all 3 types, we certainly don't need the numbers of A440M and C-130J now we have the C-17s, certainly not after we pull out of Afghanistan. With the C-17 we could get by with either the C-130J or A400M; but we are committed to the A400M and it's larger hold is more suitable for future army vehicles.
So, logically, we use up the hours on the c-130Js then sell them (or trade them in with Boeing for a couple more C-17s, if they're still building them by then.)