Given enough time, yeah. 400k salary doesn't have the time requirement. Of course if you're lucky the stock vesting could be worth more than the equivalent cash, but probably not so much now that ZIRP is over.

Facebook stock grants vest every three months, so it's as good as salary, so a senior engineer will be getting >$50k in stock every three months from day 1. Google is the same, except it's monthly. Not exactly the same as cash, but close enough for budgeting purposes.