there is no doubt about long term investment in bitcoin can bring financial prosperity.
That is not my area of concentration, where you said one should set aside a fix amount that he or she we use for long term investment is my focus, let me correct you on that, because their is no how anybody can set aside a fix amount of money to invest in bitcoin not in this hard economy what you should be introducing is the DCA strategy where someone can buy their bitcoin on a weekly or on a monthly basis for smooth and easy running of your bitcoin investment for long term.
It seems that you also do not understand the meaning of the DCA strategy because what is meant by setting aside money to be able to invest in Bitcoin is a strategy and it is also the same as the DCA strategy that you mean. Because DCA is buying with the amount of money that is available every week or every month and if the money is not there how can you run the DCA strategy more consistently every week or month? So first understand what others are saying because setting aside money is also part of the strategy and it is also no different from the DCA strategy.