What personnel?
Currently there are 2 crews worth of seedcorn guys who may or may not come home. The first student crew don't start training until late next year. It's going to take a more than a while to work up the 24 crews required.
And to imagine that the Sentinel can be in any way replaced by the GMTI/SAR Lite sets that RPA or Helicopters can carry is pretty fanciful as well.