I'm really indifferent to the whole emissions thing. If they had a system that didn't choke the trucks power and benefitted the environment, I'm all for it. I don't mind the cost of DEF at all. I mean, new trucks are $80,000. If you're averaging ~500MPG for DEF use, over 100,000 miles driven, that's 200 gallons of DEF needed. Supertech is what, $10 for 2.5 gallons? So that's (80) 2.5 gal containers I'm buying over the course of 100,000 miles. $800 in DEF to drive 100k miles. Sure, $800 is a lot of money. But factoring in the cost of what it takes to drive that truck 100,000 miles (truck payment, insurance, diesel, fuel filters, maintence, etc), the cost of that DEF in relation to the rest of the running cost of it is really insignificant.
But if the shit is going to cost me 5 grand to replace the bullshit when/if it fails, you can fuck right off and I'll bluetooth emissions it.
It also will cost, what, $2500-$3k to fully delete the truck? EGR delete, new exhaust, etc. From a sheer cost perspective, it's cheaper to keep the emissions bullshit (assuming it doesn't shit the bed, obviously).