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.