I know the "replace-the-pickguard" feature was one that Taylor touted. Heck, if the guitar took off in the marketplace, it'd be a boon for them. But that the guitar is not popular enough to justify continuing their manufacture (and thus no support in pickguards and pups), take heart in the fact that
any good electric is good by virtue of its build and playability;
these are the core trademarks of a good electric, and electronics are simply added/modded later to suit your liking.
Think about it: folks have been swapping out parts to their electrics since day one, and now more than ever. Even a pg is not difficult to find, either by virtue of a few mouse clicks to a simple custom-cut from any of a number of skilled guitar techs. And pups? Whoa, flavors abound from off-the-shelf to the myriad custom winders who will build you pups to your near-exact specs. Then there are pots, caps, etc and you can personalize to your heart's content ...or leave it bone-stock and have a "classic" 37 years from now. Today is, arguably, the golden era of guitar-parts options.
It sounds like you feel the factory abandoned you and your SB. But if you received a headsup on their demise, I'm not certain how many folks would really go out and order another pg or any spare parts for that matter. So perhaps they simply did the simplest thing and ended the line to move on. Take heart that you own a good guitar that you clearly love playing. Ultimately, the actions of the factory does little to affect your real enjoyment of an excellent guitar!

Edward