An interesting report. A lot of these designs really go the "whole hog" on brute force designs. This really increases cost and in my view makes realistic reproduction questionable.
I think the best positioned to ride out this crisis is RBH. Their designs seem very intelligent to me on the whole. They make their drivers here in the US.
I think manufacturers like Perlisten will be in a pile of hurt and probably go under.
Dayton have manufacture in the US, Europe and Asia. They are wise to concentrate on DIY now.
I think for the foreseeable future DIY will be the route to superior sound as far as speakers are concerned.
I do note and increased attention to inwall systems in your report.
As I have commented before, the system of mine that garners the most interest is my inwall system.
It is a compact 3.1 system that fills that very large space with ease. It is a very good AV and audio only system. So I am not surprised to see increasing interests in these systems. In wall systems can be designed to be very good audio systems indeed.
It was my wife who wanted and insisted I design that system.
Returning to DIY, if things get unaffordable from the activities of the current deranged occupant of the WH, I would certainly be open to working up DIY designs including ready to go plans for C & C shops which are now available pretty much everywhere.
There are lots of good drivers available from Norway and the UK, which will avoid tariffs on goods from Asia, especially China.