or, it's better to say, in 'altcoin community consciousness' (the set of shared beliefs, ideas and moral attitudes which operate as a unifying force within community)there are two main concepts of what altcoins must have to grow in value in a long-term perspective.
Of course, everyone will agree that a responsible development team and altcoins listing on main exchanges are very important,
but if that's ok, what else?
1. 'infrastructure' theory
A good altcoin must have good infrastructure (growing around altcoin services).
2. 'innovation' theory
A good altcoin must have new innovative features and provide better maintenance (first of all, as a payment method for goods and services)
Let's add one more theory.
3. the concept 'nomen est omen'
3.1. A good coin must have a bright name, an idea, a memorable trade history, to be a meme.
3.2. The earlier the release date, the better.
Why?
The first altcoins with bright, memorable names and/or dramatical trade history are like collectibles.
Investments in collectibles grow in value in a long-term perspective.
You can add an infrastructure, you can add innovative features - to any coin, theoretically, but you cannot change the past,
you cannot change the history that is in price logs and in a people's memory.
Thanks for reading. Have a good day everyone!