There's no chance this will work for them when their stock is crashing and there's no growth. High performing employees already have incentive to leave and get new stock grants elsewhere, they will leave at a higher rate now.
I've never used the mac version, but Squirrel for windows works great and is unobtrusive. The Mac version promises the same: "Squirrel is an OS X framework focused on making application updates as safe and transparent as updates to a website.".