how can you say that this is the disadvantage of bitcoin. i think bitcoin is still not so much mature it still need a good time to become more famous. i think it will still take some time when merchants will accept bitcoin and will do trade in bitcoin. the transaction problem will also be solved very soon.
i mean, bitcoin already has 8 years, and you'd expect that cryptocurrency with a $16billion market capitalization (~= top120 country by gdp) would be "mature"