At least for my state, the emissions test a car has to pass is whatever it was supposed to have passed when it was fresh off the assembly line. So older cars do not have to pass stricter newer standards that newer cars have to pass.
Now, granted, wear and tear will eventually result in an older car not passing its original standard, but at least the standard it has to pass is fixed, rather than a moving target.
Extremely rough example numbers: Instead of testing a million cars for $20 each, 10k cars are tested for $200 each. 85% of testing stations shut down, and the rest downsize if they can, but there's still plenty of them around. The total cost of testing drops 90%. The state taxes every car $2 to pay for the randomized testing; being selected means you lose an hour driving to the station, not that you lose $200 of your own money.
And yeah I enjoy having my car shut the hell up and let me drive.
Last year, or the year before, Texas dropped emissions testing, except in its most populous counties.
If it passes the sniffer it passes the sniffer, other than the parties who are whiny because they stood to make a buck who cares?