Yes that can be really useful but the complexity of the process and people being still unaware of such technologies will suffer undoubtedly. If you want a fair market then everyone needs to be aware of how the currency of the market works otherwise it would be very unfair for a good number of people. But, in future it would be really useful as it will reduce our hassle of carrying fiat money or having the fear of losing them.
Absolutely you have a point due to we have also different opinion at different people ,maybe its not the right time to implemented thier system if in case,all you need to do is people make aware about to used iT ,and of course if will happen, it very great news for all of us ,