the P-series was still produced in this millenium
Ruger still has parts for and will repair P series pistols. (had mine there last year) In fact the P-series was still produced in this millenium. The P94 until 2004, the P95 until 2005, and the P345 until 2006. They are tanks and will last forever, there are alot of them out there.I'd be surprised if they do. The P-series was never that popular and has been out of production for a long time, so long that Ruger doesn't even support them anymore. The poor market reception of the original PC9, etc. was probably in part because they only took P-series magazines and very few LE departments used them.
Supplying the PC Carbine with an SR-series and offering an American series magazine well was an obvious necessity but the Glock magazine well is where the real attraction is.