At the core of the crypto- controversy “scam or new asset class?”, is a personal belief from which all else flows. If you think that Bitcoin is a Ponzi scheme, everything which is generated from that essential belief only serves to confirm a negative opinion of cryptocurrencies. No amount of ‘evidence’ is going to dissuade one of these thinkers from believing bad things will ultimately updo Bitcoin. The only problem for them is how to prove that the value of bitcoin will go to zero, even though Bitcoin hovers around the $10,000 mark. If they wanted to profit by the misfortune of others, they might even purchase a Bitcoin short position.
On the other hand, if you believe Bitcoin is only the beginning of a new asset class, that hundreds, if not thousands of other cryptocurrencies will follow, that many of them will be widely traded and prove to be a very lucrative investment for those who bought in early, your problem is two-fold. First, you have to prove that the value of bitcoin will go as high as one million dollars per coin, even though bitcoin presently hovers around the $10,000 mark. Second, to take advantage of this glorious insight you have to choose in which cryptocurrencies to invest.
Ultimately, a sufficient number of use cases will prove the value of cryptocurrencies, or not. Be on the lookout for those. Uses cases are the best argument you can make about in which cryptocurrencies to invest or if to invest in Bitcoin at all.