Our world changes constantly and if you want to move with the times and to progress along with the rest of society you should accept bitcoin. No problem in using usual money as well as digital currencies if it gives you comfort. If bitcoin disappears it doesnt mean that fiat money will grow.
Yes, bitcoin is the product of our technological advancement and whether we like it or not there is a changes of monetary system in the near future to make the world fully digitally run as what our world marching unto it, but as of this day bitcoin and real money are interconnected with each other as what mostly people really do by converting bitcoin into their local money, so bitcoin and fiat are both important in our daily life.