The 102DL3 coaches aren't gone. Not yet, anyway. And the 102DL3 did not emit soot clouds anyway.
If the government is so worried about bus emissions, why don't they go ahead and ban smoking everywhere? That would help more people than choosing emissions over fuel economy in buses. And how come new aircraft both use less fuel and emit less pollution, while new buses use more fuel to emit less pollution?
I smell cars and pickups driving by that emit more pollution than a bus. Crack down on those pieces of [edited] if you're going to crack down on buses. I bet locomotives and ships are allowed more leniency than buses, considering all the old locos and ships still around. Not that buses should pollute more, but that others should pollute less. And outlaw smoking already!
When Greyhound goes bankrupt for the third time, they may not have a chance to recover.
Here's why the government is so worried about medium and heavy-duty vehicles (like buses and trucks), they make up just 5% of vehicles on the road but they are responsible for 23% of the greenhouse gas emissions from entire transportation sector.
In other words, if we make changes to that small amount of vehicles, it can have a huge impact on emissions.
The government has also passed the "Tier 4" emissions regulations for locomotives. There are also regulations on ship emissions, but it's a more complex issue since very ships used in the transportation sector are registered in the US (and therefore subject to all US regulations).
All vehicles, regardless of age, are required to remain in compliance with the emissions regulations at the time of their manufacturing. So old cars will always pollute more. The only way to change that is to make older vehicles meet tougher standards, or force them to be retired. That's what's going on in the trucking industry but it would be incredibly unpopular for personal cars.
Banning smoking wouldn't help more people than lowering the emissions of trucks and buses. We've made great strides in reducing the number of people who smoke. Outright bans on drugs don't work and they force addicts to purchase on the black market, where the government can't charge a taxes for things like public health impacts.
My point to you was this... those things you complain about happened in the past. Greyhound will likely need to keep the Premier seats for a few years to make the purchase pencil out, the D4505 coaches aren't going away anytime soon. What do you do now?