The average stay at an agency was something like two years. That's an eternity for an online job nowadays. Many online companies don't even last that long. If your company has been around 3-5 years, you've got quite a heritage story. If you've been in the same online job that long, they look at you funny, unless it's your business or you have some vested interest.
Online jobs make advertising jobs look like banking jobs.
So, the clock speed of jobs has increased. I think it means that one works for oneself, even if they work for someone else. The job at hand needs to remunerate in coin as well as in a growth curve that adds value to that person moving forward. Some denizens of Mad Ave.