Having served on a couple of orchestra boards and boards of other non-profits, I doubt strongly that the Columbus Board has much interest in "union busting." Very few people serve on orchestra boards who don't have a passionate interest in great music, and they usually accept their positions knowing that they will be expected to reach into their own pockets to make substantial contributions to the orchestra.
The NYT quotes the Board Chair as saying that the music director spent very little time helping with the fund-raising in Columbus. If that's true, it's unfortunate and not a problem in Columbus alone.
Money makes pro orchestras run, and artists (especially music directors) don't have the luxury, in a highly competitive fund-raising environment, to leave the fund-raising solely to the Board. Donors want to feel part of the process, and if the music director won't see them, they don't have to go far to find another arts operation that will engage them fully in exchange for their contributions.
There is money in Columbus, but there is nothing like the orchestral tradition in Cleveland. What was the Columbus Symphony thirty-five years ago? I know that at that time, Szell was a superstar in Cleveland.
Without an orchestral tradition and a fully engaged orchestral fund-raising program, it's too easy for that Columbus money to go to OSU...