As a newly-minted OW Instructor, (passed my NAUI ITC today), I will say this...
(and I've had more than a few "celebratory drinks", so please forgive me if I overstep my bounds...)
You will NEVER win over the "Old Guard" types who own/run the shops, dive outfits, manufacturers and call the shots at the major training agencies. It ain't gonna happen.
BUT, now you DO get to influence the NEXT generation of divers. The "New Guard" as it were. If they see optimum gear configurations and procedures from the get-go, then that's what they'll emulate. They'll have no frame of reference. You'll be able to literally SHAPE and MAKE them as divers.
BP/Ws, long hoses, "Fundies-style OW courses", and OW students being exposed to perfect "cave trim" and higher standards of excellence?
That's the future. But only if you make it so. I NEVER wanted to be an instructor. Ask my wife, who got me down this path. But now, I realize that I can influence the course of the dive industry one student at a time. Yeah, I'll lose some, but for every one I "save", we're that much stronger.
It's a long-term commitment though, and one that takes a huge ability to swallow sh*t. "Yes sir, no sir, three bags full!" is your mantra. Until you can "yes sir" your way into a leadership position in an agency in a way to affect change, you can't do much.
"Yes sir" your current leaders to death. Work your way up the ranks. Kill them with kindness, don't make waves. Think of it like the Soviet system, where you are politicking and ass-kissing to get ahead, but then use your authority and position to forward your own agenda. In this case, the agenda is to foster the DIR mindset, ideals, gear configuration and procedures on the next crop of divers. It CAN be done, but it takes work, dedication and working within the system to make it happen.
Think of it like an insurgency. They work, since I've seen their success rates. DIR penetration into the mainstream dive agencies and curricula is going to be conducted like an insurgency. Win the "hearts and minds", show the populace a better alternative to the accepted mainstreams, and THEY will be the ones to demand more.
I'm doing my part with my cell here in central Texas.
DIR Insurgent.
Keep the faith.