You Are Not Paid to Write Code
My working theory about this is that the industry is driven by resume-driven development. Recruiters filter resumes with a keyword based search : 'Do you have React experience ?', 'What about docker ?', 'Do you do Ruby on Rails ?'. If you cannot show experience in the current hotness, your chances in the job market diminishes. So people pick up the new hotness and implement their next solution with that technology whether or not it is the right tool for the job. If we fix the job market, this problem might automatically disappear.Another solution could be encouraging personal projects. Many companies over-work their employees to the point that they cannot do anything in their spare time. Give employees free time and encourage them to play with new technology in their personal projects. The curious ones will have an outlet to channel their energies and you will get a rock solid stack. Also, they will be knowledgeable to take you forward when a problem that requires their newfound knowledge arises in your organization.