Anybody who is directly responsible for the lives of others, as part of their job duty, should receive regular health checks for both their body and mind.
These drivers should be regularly retested for competence on the road, too.
This video is barely worse than I have experienced in a mini bus...Random lane swaying, crossing double white lines, meandering into the no stopping area on expressways, zero consideration for other drivers, I can safely assume no use of mirrors and indicators.
I do hope this was nothing more than a reckless driver (not a stroke or mental illness), but there needs to be more done. There won't be...just look at all the accidents and problems over the last X years, but there needs to be.
Put your seatbelts on if they work.