Are you suggesting making the current XP I have a switch barrel rig? Because I need to keep the .350 Rem Mag for deer hunting because of Iowa's wacky laws on legal cartridges. Nothing smaller than .35 caliber is legal for deer hunting here.One viable option for the XP...Switch barrels
Since you like the XP-100 platform better, I would recommend you to start saving for what you really want and what you like better.
The brass and the popularity of both these are going to be around for along time.
The PRC is already more popular than the 6.5-284 ever was...It hurt just a little bit to say that
You can't go wrong with either chambering.