If you can program your way out of a paper bag and find your ass with both hands and a google search, yeah.
Which isn't to say that everyone can feasibly walk away in 60 days. If you're waiting for compensation to vest after an acquisition by Yahoo!, say.
People are rightly wary of hiring untested kids fresh out of college because so many of the just plain cannot program their way out of a paper bag. Not to accuse your friend of incompetence, it's just that until you have some kind of real portfolio, it's damn hard to sort the wheat from the chaff.
So either you're soulless and refuse to leave, or you're incompetent and you're scared to leave. Either way, not hiring them seems fair to me.
So... in your world, everyone (not soulless and incompetent) is currently employed where they agree 100% with the direction and vision of the company as dictated by management. If, sometime in the future, they don't agree with management decisions, their only course of action is to give notice and leave. Pensions, security, and seniority be damned. Since they must also do this within 60 days (more than enough time according to Yammer), having another job lined up is not guaranteed either.
Maybe I missed the part where Yammer would automatically hire ex-Yahoo employees on the spot, at the same pay-rate and bonus structure, if they quit within 60 days?
I'll put my money where my mouth is. Know a talented engineer over the age of 30? Or 40? Or 50? I know several prestigious firms that would be eager to hire her. Contact me and I'll share my referral bounty with you.
Oh darn it, you said "her", which would be an EEOC win for said corporation (if they had been feeling legal pressure), although women in the profession suffer age discrimination as well - being less numerous, you don't hear about it nearly as much.