IMHO - A lot of the new $4000 "bargain" speakers don't compete with properly set-up, tweaked, and re-tweetered Dahlquist DQ-10's either, not to mention DQ-20i's or Dq-30's.
While technology does improve, a cone attached to a coil suspended inside a magnet isn't exactly high tech. Crossover design and construction still use the same exact elements. In general I think it's Marketing that marches on.
Drivers are lighter and stiffer but if you ask me, the most important speaker advancements have been in the understanding of time and phase issues - something which Bose designs not only have no concept of, but completely mangle. Bouncing a bunch of mid-range drivers into side and rear walls while listening to the ported end directly - I don't think so.... unless you're pretty sure your walls are properly timed and have flat frequency response :)
The Bose line NEVER measured up to better speakers of it's day. So it still doesn't measure up. What Bose had was an imagination unfettered by the actual performance of his designs, and the marketing savvy to convince a growingly affluent, yet unknowledgable, public of his imaginary prowess.
Just wait till you need to refoam all those little drivers, too. Loads of fun.