Do you think we will have a time that there will be no new tokens created and people will stop investing and supporting new tokens or coins?
I don't think so, at least not anytime soon. As long as people continue to innovate, new ideas will always emerge that will become the basis for future projects (altcoin / token ).Besides that, new problems will always arise that might be solved with blockchain technology and cryptocurrencies.
Maybe new altcoins will stop appearing when new technology replaces cryptocurrencies, the government starts banning cryptocurrencies, or maybe investors stop investing because of too many scams.
New coins will always appear because that is just human nature, it is natural to look at something that exist already and say I can do that better, most people never proceed to show that they can but there are a few that do so, and an example of this was satoshi, he looked at money and saw that we were headed to a direction that he did not liked and set himself to create a new form of money and out of that he created a market that at the time is worth half a trillion dollars and it does not seem there is a limit to the growth we can experience.