I'm not sure that within 10 years bitcoin will be accepted in every country, but I can be sure that it will probably be accepted in 10-20 countries, this is my guess.
I estimate that bitcoin for the next 10 years can be accepted by many countries, but not as a means of payment. Bitcoin can be traded as an investment tool where the state can monitor to reduce negative impacts.
Like in my country, bitcoin is prohibited as a payment tool, but bitcoin is not prohibited as a futures investment, so bitcoin investors can still enjoy trading comfortably and safely because they do not violate the law.