Yes it must be used always so the money can circulate. They are afraid of something else it is the lack of knowledge that scares them. Bitcoin might be a little hard to learn but while using it and asking,reading news and more you will get used to it.
It's going to take awhile before these people adapt to bitcoin, some have a hard time understanding bitcoins concept overall.
Some can't wrap their minds around it that they can't physically hold bitcoins and that it's a digital currency.