I truly doubt it takes a full "year" to see a doctor.
That seems a bit radical.
Unless you live in some area in the middle of nowhere.
And refuse to drive to the next populated town.
And even if that were true, how would ACA have anything to do with that?
ACA is simply private healthcare insurance, i.e. Blue Cross, Aetna, United, Humana, etc etc.
Since healthcare is healthcare and employers that offer healthcare directly to employees, the providers listed above are the very same healthcare providers offered by private employers.
ACA is not some government healthcare plan where you get a card with Obama's photo on it.
If you joined Aetna thru an ACA exchange, or joined Aetna thru your employer, Aetne is Aetna. One in the same.
If your doctor doesn't take one Aetna, he will not take the other Aetna either.
Obviously, that doctor does not take Aetna at all.
In other words, you doctor operates on a cash only basis.
And in that case, I'd find another doctor.
Any doctor too busy to see a patient for one full year, again something is up with that doctor. Probably he loves his golf outings and European vacations over seeing those icky "sick" people.