The only flaw I can see see is the transaction speed which is slow, so it cant be used in some stores, but in the future this problem will be easy handle by the developers, most of the time people hate bitcoin because of that people invest in the wrong time and lost money, and then people hate bitcoin because they don't understand with bitcoin and only believe in the negative news publish by the media
I agree with you that is the problem on bitcoin but the other issue is they are afraid to lose there money they think that bitcoin investment is only a scam and they dont have any idea how to invest on this currency,they always heared that bitcoin is not a good investment that's why many people are afraid to invest.