So, what kind of life might I expect with BNC's, plugging and unplugging
them ?
They certainly weren't designed with multiple in and outs in mind, but
they
are kind of
well built, and I imagine they would take a fair amount of usage this
way;
perhaps ?

Anyone have any experience with this kind of an application ?
What would degrade first in them; the center pin ?


Just use BNC's and don't worry about it, they will last for ever.
After all almost every bit of test equipment uses BNC's and they endure
multiple connections/disconnections without worry.

73
Jeff