IMO, this is where many of the top tech companies will struggle.
I work at a big tech company, and we've been bleeding talent over the last 18 months. Many senior and principal engineers have left to do their own thing, usually working on their own thing or for a startup. Many of those that were laid off have probably done the same, where there are opportunities. In the next few years, we'll see new tech take over, and many big companies becoming poorly-run dinosaurs - basically becoming the IBM's of the world...