I can see why you might want to keep all three, for while maybe at the gross level they all do the same thing, they all reach that point by wildly different routes.. like an antelope, a kangaroo and a Przewalski's horse. If you are into the zookeeping aspect of airguns you can't lose any of these species.
I can't see the point in owning more than one PCP - they're all the same - and magazine rifles are just a faff.