Do what I did with my Spica's in 1989 - if you're really planning on having the speakers that long. If you're buying new, tell the dealer that you will purchase the speakers ONLY if they include a replacement set of drivers up front - at or near cost. If they're sourced from China, it shouldn't be all that much. This is not a bad idea with any manufacturer, regardless of location, if the drivers are not stock from one of the majors. Seal 'em up in plastic.
I've used one pair of tweets, which were still replaceable at the time, and still have a full set in the closet (along with the speakers)!
I've used one pair of tweets, which were still replaceable at the time, and still have a full set in the closet (along with the speakers)!