My understanding is that Peter has someone who works with him on the high end cartridges, presumably so that one day they can continue the work. I have not asked Peter that directly (an excess of delicacy on my part), but I have heard that from a dealer. With cartridges like the strain gauge and the Hyperion (with its cactus spine) one is dependent on SS for future service. Those with more conventional builds could be serviced by the usual suspects.
@neonknight I hear you about the Grados. I have a Statement 3 that sits unused. I can't say there's anything wrong with it, but it doesn't excite me. The MP-500 I discovered when I was concerned that the Deccas would no longer be serviced with John Wright's retirement, and it comes close to the Decca sound and liveliness. Initially I didn't hit it off with the Sussurro, but with some very careful attention to VTA it suddenly came to life and impressed me enough that I moved up to the Hyperion, which is better still. I rather hate to say it, but it is better and more engaging than the the Decca. I never thought I'd say that. If you can stretch to one of the Soundsmiths I think they can outperform the MP-500, but as I say I haven't heard one of the high ouput SS cartridges. PL himself says he only makes low output versions because the market demands them to use with expensive MC phono stages, and he implies that if it weren't for that he'd stick with the high outputs.