Good news indeed!!! I couldn't agree more.
The decommissioning thing has always been a bit of a red herring. There was never going to be any plausible excuse for a return to the violence of the pre-Good Friday days, and putting whatever arms beyond use at least reduces the potential for some dissenting faction getting their hands on the kit required to "continue the armed struggle".
In addition, with their biggest foreign support base now pledged to "combat world terrorism" I do not believe there was much choice.