The rank and file of the unions need to confront their “leaders” and ask why they are being sold out.
Just a wild-eyed guess, but there may be guarantees made to the rank and file of health care or insurance which are unfunded, for what ever reason, but likely tied to either basing such claims on older life length paradigms or the >ahem< movement of funds which make those benefits impracticable without either Federal intervention or some severe adjustments to the inflow of money or benefits themselves.
In short, without Obamacare, the benefits cannot be delivered. One way to lose power in organized labor fast is to renege on promises which the dues have already been collected for.
All sorts of people are looking to stay in power by using other people's money to back the promises they made.