No I do not think that youngsters or anyone should go all in on bitcoin because firstly it's prices keeps on fluctuating which means that if there is a chance of increase there is equal chances of decrease in value. Secondly it is not centralised form of currency which means it's not regulated by any government or bank so it's not a good option to go all in with it.
Yeah you're right that bitcoin is a fluctuating currency, but thinking for a good future for young generation learning bitcoin can be beneficial to them. Even it's a volatile one but they will have a good opportunity ti save and earn for the future rather that drowning themselves with social media or non sense activities which may ruin their future.