Without something like a 20-30 percent discount from buying items paid with credit card/paypal there's virtually zero incentive for the average person outside of crypto-idealism to use Bitcoin. Yet, I can't remember the last time - or if ever - where I've seen an item at a discount if paid for with Bitcoin. They always price it equal to the dollar value at the time.
Where on earth is a retailer going to find a 20-30% discount? If they could they'd already be offering it.
Newegg did offer some heavy discounts for a while but it's not sustainable for them. Perhaps if cost savings spread throughout the supply chain there might be a cumulative discount that's enough to turn customers on. That's going to take time.
Forget 20-30% discount. A 3% discount on all items purchased using bitcoins will make people flock to it. I am not talking about the deep discounts you get on some items during clearance sales.