Of my 5 electrics and one acoustic, all can be replaced. The Reverend is such a sweet P90 guitar, but it could be replaced with another Reverend, like a smaller solid body Sensei.

That leaves the Washburn WI66 and the Hell No.2.
I'm a humbucker lover, and the Washburn fits me like a glove. It is replaceable, but I'd hate to have to do that.
The Hell No.2 is also replaceable since more are in production, but this one is a unique pre-production guitar that feels and sounds so good, I couldn't really replace it. I guess it wins!