Not all altcoyins have a future. I think that within a few years, only 10-20% of the total diversity will remain. The remaining projects will be forgotten or abandoned. A good product must have value, if it does not exist, the market will exclude it.
Some would say a coin exists if the blockchain is alive and running, not letting the market decide what does or doesn't exist.
The coin it self will decide wha twill happen to it.