The problem with this is that it drives the price down.
using Bitpay or Coinbase, and settle in USD, they are just driving the price down.
You realize that you completely failed to explain why you think they're driving the price down, right?
You state your theory but then have nothing to back it up. Why is it necessary to back it up? Because many would disagree with you on this.
Many feel that adoption (which is the other side of this coin you present) balances out, if not increases price of bitcoin.
So why do you feel it outweighs and in fact nullifies any benefit of increased adoption?
-BB-