> I worry that MBAs of other companies will take the lessons learned from Silicon Valley WFH and misapply them.

Don't worry: It won't be the last time it happens. How many shops have I heard say they are "Just like Google" only to find out that what they mean by that is that they have beanbag chairs?

> But it's potentially a lot cheaper up front not to have offices, just like open plan offices were cheaper, so I fear MBAs may discount these drawbacks and make WFH the default in many, many places where it's a bad idea.

They'll learn that they need a higher caliber of employees to make it work. Incidentally, these employees are also now hirable by competing SV firms that can and will outbid them.