How many brands use own drivers?

Klinger Favre and Ryan Audio

Focal in France..

Audio Physic (in house designs manufactured to their specs)

"Old Thiel" after the 2 2 and the 3 6.

I am worried that the next speaker I purchase will have unique to the company drivers.  The most likely accident to a speaker is driver failure due to electronic or physical (child poking a finger) breaking it.  Then, if the speaker is over say 5 years old or the company goes out of business, I would be stuck with a $50,000 pair of coffins instead of speakers.  This is a serious concern of mine.  I currently use speakers which have drivers which are retrofittable if not identical after 25 years on the market.

Does anyone else worry about purchasing speakers that could fail and not be repairable?