I didn't say there would be no impact.
Business management has to adjust to changing circumstances all the time. That's their job.
GM didn't pay $39B when they took their non-cash charge. They made an accounting change.
The world will change a lot by 2013. If AT&T cuts benefits, it could be due to reasons other than this change in the tax rules (say, losing exclusivity on the iPhone and losing customers). The charge is a convenient whipping boy that they're hoping to use to sway changes in Congress. If they cut benefits, perhaps they'll lose important employees and have to spend more to recruit and train than they would have had they not made the benefits cuts.
In short, this isn't Armageddon!!!!111, no matter how much Rep. Boehner claims it is.
Life, and business, isn't binary. Tax law changes that close loopholes aren't always bad. Why should non-profits not be treated the same way as large corporations when it comes to health benefits? AT&T and other big companies taking a charge for a change in the tax rules isn't going to destroy their business nor their employees.
Maybe we'll see how strong the arguments on both sides are at Waxman's hearings on April 21.
Cheers,
Scott.