I almost got one when they came out from Peach Guitars but it was gone before I was able to answer that email! I think it was VOS and not aged and "reasonably priced" for a custom shop limited edition guitar.
I know you can have one that is not signature edition (Strat, Martin or Gibson) at any time and perhaps cheaper but those Strats were not really that much more expensive when new, if at all. I only passed because at that time I didn't like the colour all that much. Shame on me. And you can still have Clapton's Martin acoustic, and it's also more or less the same price as their non-signature guitar. How hard can it be to come to an agreement to keep making some kind of signature MK guitar, be it Strat, Martin or Gibson? Make a very limited collector's edition for all I care as well, nothing wrong with that, but why not something aspiring musicians can actually afford as well? If you're not going to make a MK signature guitar, who's are you going to make then? 50 cent's and van Buuren's? Come on?!
Yes, I hope MK has a very solid reason to not continue with signature guitars. Should they have poor sales, I'd get it, but they're selling like crazy! No matter what the original asking price is, it will sell. And if it's almost affordable, like MK Strat was when it was available, it sells like nothing else. Even to this day.
Not sure about aspiring musicians though. I remember literally "smelling catalogues" with MK Sig Strat, digital catalogues that is. I could never ever afford such a guitar when I was a beginner or even an intermediate player, and now when I stopped being a beginner and get-a-life fan, I just don't need it anymore.
But should they reissue MK Sig, or better yet, made a more affordable version of it (say, Mexican-made), it would be awesome. After all, I think the appeal of signature instruments should be directed at aspiring musicians, young musicians, and not professionals who have their "signature" guitars anyway.