While I was gone you guys have touched on why we don't have every gadget we want.
There has to be a demand in the market place that goes beyond a few special needs musicians.
While I see your point and you may be right in general, I think in this case the market demand may go beyond the needs of just a few musicians.
Bose has tapped into a great market of solo buskers, giggers, etc., with the battery powered S1 Pro. I suspect they have sold many hundreds if not thousands of these units. A lot of folks I know (including me...) have more than just one!
The draw about the S1 Pro is it sounds great, is easy to set up, it's lightweight, and can be battery powered. That is a killer combination! Especially, the battery powered part for outdoor buskers and giggers. Yes, not everyone will get full use of the battery, but many people enjoy having that option for when they want to use it, and for outdoor buskers/giggers, it's a game changer.
I suspect battery power is such an important part of the S1 Pro's charm, it's the reason Bose started offering the S1 Pro with the battery installed. They want customers to think of this systems as a "go-anywhere" mobile system. They knew their superior sound and battery capability was what set the S1 Pro apart from the other small acoustic amps on the market.
For these reasons -- thousands sold, the great "Bose Sound", light weight, robust battery life, and mobility -- I think a matching subwoofer (or improved battery-powered A1 packlite) would be a solid addition to the S1 Pro and L1 Compact lineup.
As further example, Fishman is now marketing their upgraded "tower" system with a subwoofer, and many of the other companies with their "tower" PAs are also offering subwoofers with their smaller units.
We all know that these are direct copies of Bose's line array systems (particularly the Compact), but none of them are battery powered.
Seems to me, a battery-powered, lightweight, great sounding Bose subwoofer is the next logical step!