I don't necessarily agree with that thought now... You are betting on a coin which will have a demand 5 years down the line (assumption - fiat goes out of market in 5 years)..
You should invest in something else for next 5 years, have enough profit to come back to this project after 5 years from an investment point of view then ... You will still be in green..


Plus, there is no guarantee that cryptos will survive for 5 years... It is a risky investment still..