Is it good long term investment to buy bitcoin?
The answer is YES, why? Because now the demand of bitcoin is increasing and a lot of company now is accepting the bitcoin what more in the future so it is best to invest now and hold it in long term.
It depends on the definition of long term. I believe in 10 years, there will be numerous banks providing service based on bitcoin.
i also think long term is at least 10 years. for most people that's way too long as they are chasing instant profits. long term is always the best.