This problem (I'm one of the 'victims' of a frozen corporate pension and eliminated retiree health insurance) has two consequences. First it makes it harder and harder for the average private sector middle class taxpayer to keep affording the legacy public sector deal, because we are falling farther and farther behind -- benefits are watered down and many of us haven't had our incomes increase for 5 years or more, and adjusted for inflation most of us are making a fair bit less than 5-10 years ago even as the costs of these legacy plans keep rising. If I make 10% less (after inflation) than 5 years ago, it's hard for me as a taxpayer to keep up with the funding needs of public retirement plans whose costs are steadily rising.
Secondly, it gives the elites an opening to "divide and conquer" the middle class by pitting the "pension haves" against the "pension have nots" -- and hope the (mostly private sector) have nots will backlash on the public sector "pension haves". (We've seen that battle play out here more than a few times.) Frankly I'd rather see the private sector middle class stop getting screwed instead of bringing the public sector down to "our level" and fueling a race to the bottom. But for that to happen we'd need all of middle/working class America "mad enough" at the status quo to unite and stop the race to the bottom. But how do that is, sadly, easier said than done.
Anyway, the more "divisions" they can create among ordinary folks, the more these elites can screw us all because we're too busy fighting amongst ourselves to notice.