Slow isn't the word, it usually happens due to a need...and after the fact. Having SMEs in positions to effect change sure helps, most doctrine writers I've met were old retired (and then some) fellas that may need to stay that way. Does no good either way if the signatories aren't on board. I will say that recent events have us going in the right direction.
I believe the Chief in the article was saying that snipers are (or at least should be) obsolete, that any soldier should be able to support that role. From what I read (correct me if I'm wrong) that same fella was a sniper at one time. I know things are perishable but that guy has lost his
**** mind. If you think we are obsolete then you are fooling yourself, instead you should be trying to convince the enemy of that.
Good luck, just maybe they have something right.