Blast containment in general, bully. Having better control over explosives is generally a Good Thing.
Now, the other aspects of what's being described in the article? Mixed feelings.
The testing sound like it has potential, but I still get the feeling it could still stand a few scenario tests. Just how was the Fly Bag tested? Under what conditions? It will help to see if more parameters need to be considered like perhaps a positive-pressure hold (to better simulate an in-to-out pressure differential that would occur while in-flight).
And the consortium wanting the bags to be mandatory? Hold your horses. Let's make sure we get this right first.
Meanwhile, this'll do diddly for the current preferred bomb technique: carry-on or wear-on explosives. Who's betting the next plane is bombed out of the sky courtesy of a kinky woman who pulls out a dildo bomb while in the toilet?