Only the bullshit kind of consulting McKinsey is known for, IMO. The value of someone coming in and repeating what the smart folks on the team are saying is no longer there. Plenty of boutique consulting shops are eating just fine right now. Delivering real results/solutions and being a SME is always in demand.
The culture engendered into corporate America by businesses like McKinsey is exactly what causes economic uncertainty.
When the only thing that matters is the number at the bottom of the piece of paper being big enough for some analyst in lower Manhattan to be happy, humans will do all sorts of unpredictable things to make that number be that way.
The difference is, before, people had at least some confidence in their ability to make a living. We've whittled down the average person's wages and job security to the bone and when people don't feel secure, they don't spend, or maybe they do, but they put it on the card... which is another problem and story unto itself. And places like McKinsey are a part of the knife that did that whittling.
Anyways, when people don't spend, businesses don't do better over the long term.
Here’s the opposite perspective:
Real disposable income is up: https://fred.stlouisfed.org/series/A229RX0 Real median personal income is up: https://fred.stlouisfed.org/series/MEPAINUSA672N