Your food is shipped (often by air), you go on holidays by plane, you drive cars etc, stopping that _is_ going backwards.
I'm not entirely saying I agree with people just flying around for the sake of it, but let's be honest, putting an end to most transport doesn't exactly seem like progress, let's also think of it this way, the problem is caused by the burning of fossil fuels, not traveling.
"companies still require employees to be on-site mostly for historical cultural reasons."
If you're a Doctor, truck driver, pilot, builder, fisherman etc, then how do you work remotely? The majority of the workforce can't just work remotely because knowledge workers can. Besides, data-centers also have a large environmental cost, remote work creates it's own mess.
I'm also a knowledge worker, but I just choose to live in the city close to my office and ride to work so I have a very small / no carboon footprint from transport.
I've also worked remote full-time, it wasn't for me, I think it has it's own set of issues.