Consider how Dogecoin is still worth something even though there are lots of coins in circulation. New units will be created every year, leaving us with an endless supply of DOGE. Coins with a limited supply are more likely to rise in price within a short amount of time. I'm talking about coins like Bitcoin, Litecoin, Diamond (DMD), and Dash. Especially Bitcoin which is the most popular cryptocurrency in the world. Who knows how the market will change in the long run as new players join the scene? Just my thoughts 
I like your optimism about the altcoins. However from my experience the altcoins are mainly capitalised during the cycles when the hype is good and it drives an inorganic demand. On the other hand bitcoin has its own organic demand over time. Hence I prefer the second always. But hopeful people are free to invest in the former. The only problem is that they need to be monitored and the social media kept track of, who knows which celeb is going to talk shit or gold about a certain coin.
Their circulating supply is often raises eyebrows because of a lot of reasons, lack of trust in the developer, premine and so on.