Interesting and relevant topic @Account Closed.
I have always been advocating, that "work from home" is what most administrative functions of businesses, should be adopting. Ideally, it's not practical for all industries and all functions and as such I don't think the 9-5 will become obsolete. But it will definitely foster a happier workforce and a more disciplined workforce.
In the work space it's not practical to work 8 hrs non stop as the laws of diminishing returns proves. So creating an environment where employees are given more autonomy and you are appraised on your deliverables, to me, leads to a more productive and happier workforce and environment.
Office buildings and office spaces maybe reduced in size as a result of this. But there may also be need for a redesign of the air circulation system as presently it facilitates the spread of the virus. Working from home also has the impact of less stress, as commuting is less and as a result of this, you have environmental benefits from lower vehicle emissions.
For college students I think it maybe a bit more difficult as their interactions and relations fostered in college has a significant impact on their future. Additionally, the hands on training and expertise will be lacking in an online environment. I also think that maturity and discipline has a large part to play in your ability to work from home and not all college students will be at this level.
As to the older generation, I definitely agree with you.
What happens next will be interesting to see but I do believe in some part, this is the beginning of the transition to online everything to some degree.