Unfortunately, I think these fears are somewhat justified. The underlying issue is that the financial payoff if the owners succeed in getting something ridiculous like a salary cap is huge. So there's an incentive for them to try something dramatic. I'm not sure that it's in the best interest of ownership to get what they want. The NBA and NFL aren't exactly shining examples of the benefits of a salary cap.
Salary caps create byzantine processes, and make player personnel moves that much more difficult.
A salary cap limits the ability of a businessperson to invest in their own business. Like all investments, I want to make sure it makes sense. The common thread through all these issues is management. I still don't believe that there's really anything inherently wrong with baseball. I see a group of owners that wants to completely eliminate the risk associated with decision making.