Ugh. These are adults. Whose delicate sensibilities are being offended? The 70 year old "get off my lawn" fan? Overall, I can't see how this is good for expanding the popularity of the game, particularly among the desirable younger demographic. It's odd for a commissioner that has been adept in growing the sport, whatever else we think of him and other rule changes he's overseen.
Brief celebrations are fun for teammates, the crowd, and most of the TV audience. It's an intense game; let them express themselves. The one I laughed at the most was the no military salutes. Seriously? Come on. Clearly there have to be some limits, and I think the current limits are more or less reasonable enough - although I'd be alright with banning the first down arm signal; that one is way overdone and is just annoying now.