I agree with your opinion, but not only Bitcoin there are also altcoins that will give you decent profits in the long term. you have to see how ETH developed until now and when Bitcoin started to rise ETH also followed suit. now even ETH reached a price of more than $2000 and this is quite a good achievement.
Absolutely right the price of ethereum rising very faster even if we can buy and hold still green market then it will be best invest range. But yes bitcoin is the king and if i have no another skills like trade then i should buy and hold btc for long time. I have to thinking skills without we can't make profits from crypto source. Buy cheaper then sold high, get signal and understand price range chert so everything need to skills.