[mrreality68]

Grading cards will always be big business especially as new money and inexperienced collectors get into collecting/investing.
Since they will not have experience they are going to gravitate more towards graded cards (especially the more the cards are worth)
However, For the people doing sets they will only either 1. Buy cards already graded or 2. they will only get graded cards that have higher values that makes it worth getting graded and the more common cards in the set will be left ungraded.
Most of the new money and collectors do not seem to be going for complete sets(unless buying unopened boxes and cases of cards) and are going more for the famous players, HOF'ers etc

Hopefully the grading prices will go down over time. But I do not see it unless there is a big drop off in volume because big business is always moving up prices and always looking at Year over Year Comps in Sales. If you drop the prices for grading (vs the higher prices the year before) you actually have to grade alot more cards to make up for the difference lost from each cards lower grading fee