I'm pretty sure the same argument came up when Eftpos was first introduced.
"Why would I want to take around these cards to pay for things, nobody has any machines and cash is so much easier.."
Once the tech starts rolling out paying in BTC will be as easy as using your credit / eftpos card.
Over the short term (12 - 24 months) yes I think you're correct, bitcoin will probably hover around its current exchange rate, because it is too inconvenient to use and there's no real reason to. But I think most of us care more about the long term outlook.
As a merchant from Australia selling software online I really want people to use Bitcoin, and will start offering discounts soon for people to use it. Since I started online paypal has been a huge thorn in my side, taking large transaction fees, huge currency exchange fees from USD -> AUD and having lots of "Buyer security" on software (basically meaning a buyer can request a refund for any reason and keep the software and there's nothing I can do about it because according to Paypal you can't prove you sent a digital product).