Well, the thought is that a strike would result in a reduction in the financial health of the company. The regulators would be forced to step in and it would be unlikely they would force an agreement substantially different from the one that was agreed to with the trustees...and possibly they would allow the company to change some of the agreement in its favour given the reduction in financial health (the downside part).
That's just the thought process. I'm not saying whether or not it's a realistic one. But I do agree great expectation, folks generally believe there will be no strike and that the deal announced today will largely be the final make-up of NAPS.