This is just bad, typical pandering. Some unions want to protect their benefits as much as possible, and they don't want members hit with the punishing 40% excise tax on the primo health benefits. However, the premium must be over $27K for a family. That's pretty damn high. How many people really have such generous health benefits?
I couldn't readily find any numbers. Companies have been trying to change their plans in preparation for the Cadillac tax starting in 2018, but also to rein in health insurance costs and to get employees to share the burden. I don't think that's at all bad. It's better for employees to be aware of healthcare costs, rather than treating it like a perk that someone else pays for.
The arguments for repealing the Cadillac tax aren't very strong. Opponents claim that it will hit 82% of all employers by 2023 because of the indexing (if they don't make adjustments, which they are). That leaves plenty of time to adjust the indexing if needed. Opponents also don't answer about how to make up for the lost revenue, which is just so typical.
Extras. Forbes complains about higher cost or lack of choice, ignoring responsible decision-making. The Fiscal Times seconds that. A different author calls it 'modest.' The typical economist response here.