I think they should be given the choice. However like you have said with the shortage of midwifes this wont always be possible, which is a shame really.
I think women do get that fear factor when going into hospital and dont trust there own bodies so think you got a valid point there, however some women would feel far to nervous and anxious having first child at home.

I think allot of women are happier with the idea of home birth after having their first child.

My thoughts anyway...