That was one of the only Mark Suster articles that I disagreed with. He made very valid points, but the truth is that since the IBM layoff of '93, there is no such thing as vertical loyalty anymore. The only loyalty that matters anymore is horizontal loyalty to your co-workers. Anyone can get the axe the moment a manager needs to meet quarterly or yearly earnings figures.
Someone with a high amount of reciprocated horizontal loyalty can be of much greater value (and greater danger) to companies. When you hire someone with great horizontal loyalty, you get to tap into their entire network of former co-workers and they can literally build out an entire new department in your company overnight because they can bring with them all the right people. Unfortunately, this works both ways as these people can also take them all from you overnight as well.
Someone with a high amount of reciprocated horizontal loyalty can be of much greater value (and greater danger) to companies. When you hire someone with great horizontal loyalty, you get to tap into their entire network of former co-workers and they can literally build out an entire new department in your company overnight because they can bring with them all the right people. Unfortunately, this works both ways as these people can also take them all from you overnight as well.