The worry will be who is in control, mil or nhs managers.
I'm not sure it matters who is in 'control' as long as measures are put in place to ensure adaquate provision and adaptions are put in place specific to military need.
QE Birmingham has shown the ability for an NHS-run hospital to also host an MDHU quite happily and provide excellent service utilising both military and civilian personnel.
I'll be sad to see Headley Court go, it was working there that convinced me to re-train as a nurse after leaving regular service (to later re-join as an Auggie). This said though the new site is excellent (I pass it fairly often on my commute to work) and will provide much room for expansion, away from the petty idiots of the Mole Valley.