Being a store of value is the best feature Bitcoin can offer, and at the same time one that attracts the highest possible market cap in the long run. Gold is the perfect example of that. Its currency aspect is poor, has little industrial utility because it's so expensive, and it's hard to move from one place to another fast, but still it has a market cap of $8 trillion. Bitcoin does almost everything better.
I already noticed how people around me start asking question about how high Bitcoin will increase and what the best allocation of their wealth is to convert to Bitcoin. I'm pointing out that the price will increase as time goes by, but that they shouldn't focus on exact price levels, because the most important thing is to have wealth stored outside the banking system that keeps gaining value, and it's a solid hedge against fiat.
The mad gains are just a bonus for being early. It shouldn't be the goal in and of itself.