Yes and no. Even without the changes to healthcare I think a lot of junior and mid range FOs would jump ship to places like DAL/UAL/FedEx/etc. People in the left seat holding decent lines wont go anywhere even with the healthcare changes, so there will be perpetual churn at the bottom end of the list. No retirements to speak of for the next decade either.

Im guessing maybe 6-8yrs until a newhire could hold reserve E190 CA, prob 8-10 for reserve A320 CA. Holding a commutable line on either equip will be a longer wait. 12-14yrs+