I don't know why it's difficult to project when we already have 10 years of history to Bitcoin, and at best 4 years for a non big alt, in this 10 years we saw adoption and use for Bitcoin rise so high. Alts struggle to get that kind of adoption unless they're old or they're so big and can spend a lot of money in marketing.

Long term for sure Bitcoin is still dominant, maybe 50 years is a different picture but 10 years? Same story.
[/quote]

Also, the amount of money generated by a big project tends to be proportional to the quality and quantity of service they offer to the public. In the case of alts, it is not in a much higher way.

The reason why it happens like this is really simple, it is not matching Bitcoin's might in any of those two aspects and for that reason it won't have the same position in comparison with the others.