12-50 vs. these 3 primes?

Hey guys I have the Oly 12mm, the Panny 25mm and the Oly 45mm for my OMD.  I utilize all 3 fairly extensively... 12mm for walk around/street, 25mm for indoor and people/groups/doggies, 45mm for family portraits and my friend's baby.  I love the results from all 3 but often times I wonder how much I have locked up in these 3 lenses (especially for somebody who is hardly an amateur)

Has anybody has the same lineup as I have and decided to go lighter w/ the Oly 12-50? It seems to be a nice money saver and from what i understand picture quality is great on it.

Thanks for any feedback