Wizards do wizardry to stay ahead. It’s just the way that it is. Training people is wizardry.
How can a business get like wizards? Mentoring, online, sharing resources, working groups, apprenticeships, classroom, distance learning, videos, intranets, trade groups, peer groups, professional associations, the list goes on.
Some businesses don’t want to train people in case they go elsewhere. If that happens, so what, it’s not big loss compared with not doing wizardry at all.