Videos on kicks - Check.
Videos on sparring - Check.
Videos on weapons - Check.
Videos on flow - Check.
Videos on drills - Check.
But if the martial arts schools have had to close their doors, then it doesn't matter.
Schools close because of mis-management. Plain and simple. If the school owner doesn't spend as much or more time on the business as they do on training, that is mis-management.
This video (a bit of a parody) describes one of many arrows that must to be in your success quiver if you are a school owner or have a financial interest in a school.