why does harry have to lose his magic powers

[dominik_reisner]

No: HPFGUIDX 74714

I thought of many things Harry could lose in a fight with Voldemort, 
for instance his sanity or his health, but I doubt that if he`ll 
lose his magical powers. Why should he? I guess if it were possible 
that wizards can release all their power in a single strike, 
Dumbledore would have done that, since he cares quite a lot about 
the WW and especially Harry.
I also don`t think that LV can take the power of a wizard, otherwise 
he would have done that to surrender his enemies helpless.
Dominik