That's a circular argument. Lots of people are reluctant to adopt a technology that isn't scalable. In't isn't exactly the Field of dreams. If you build it, they may not come BUT if you DON'T build it, they certainly won't.
This.
I was talking to the owner of the bar I was at the other day and was explaining Bitcoin to the owner. I almost had him convinced to start accepting bitcoins for payment when he stopped and was like "wait a minute, what are the block size parameters and transactions per second?". Needless to say he was displeased that in 2 years the code would need to be changed if current transaction volume continued to increase at the current rate. He then started asking me about alt coins like Doge. He decided to start accepting Doge instead because he thought it had a funny picture with the dog and he was like "you has doges?".