Anyone who has confidence in their current set up, would be MAD to change for next season, in my opinion, as the majority of PCP's nowadays will out perform the numpty behind it, unless your name is Roger.
To change because you want to try a different class, or you have lost confidence in the setup, i can understand, or if you want to sort out a backup rig.
The other reason i can understand is, if you were to be sponsored, but i think you would still have to have TOTAL confidence in the gun, before changing.
We all know that unless we can shoot nearly everyday it takes at least a season to build your confidence/iron out the bugs in a setup, unless you can by a setup that you have tried and tested.
Average Spring Gun Shooter