There is no market for altcoins, especially for clone coins.

Bitcoin found its way into mainstream use, people have reasons to carry it, but there is no ask for other coins except for pumps and dumps and scams...

However, I think there is a great growth for niches that might be available.

For example, it's now impossible to compete with Google in a global market, but there are local search engines more popular (e.g., Baidu in China, Daum in Korean, Yandex in Russia etc.).