You understand that's not substantially hitting them, right? The rules on what defines a Cadillac plan in the ACA on effect the absolute strongest unions - so grats on being wrong? You love to trump some minority as if it's a majority for everything it seems. Only just started noticing your posting, but this is a consistent habit of yours.
The Cadillac plans that the ACA hits (if you'd actually read the ACA, like I have) include provisions for reimbursing flights and car rentals. Find me a single union that provides that type of insurance, just one. Much less "all". It refers to plans that are popular with the excessively wealthy, and it's a campaign year... and look at the list of (only 27 - lol? - That's a ton, bro, really - 27/188) Democrats that are supporting the delay... all the ones I recognize are in areas where their re-election odds are dicey.
Hmm... can't possibly be to save their big donors money so they can get more campaign funding to keep their job. No sir.
And the definition of a Cadillac plan is $27.5k/yr or more in costs for an family plan under the ACA - UAW plans for employees with nearly 10 yrs service are currently barely over that threshold ($33k), any more recent hires don't break it. And mind you that's the example for the FAR STRONGEST union out there.
Also note that the tax only applies on the portion that exceeds the threshold - so a $33k/yr plan like theirs would barely get taxed (only taxed on $5.5k worth - at 40% that's $2.2k over the year or roughly $1/hr of wages lost effectively - trivial for those earning $40/hr like they do) but a $100k+/yr plan, like those that CEOs carry, would be taxed on $72.5k.