Out of curiosity, how would you know that the community is large enough, or committed enough? For example, while Julia has been in development for almost 10 yea

Out of curiosity, how would you know that the community is large enough, or committed enough? For example, while Julia has been in development for almost 10 years, a lot of the community has now been around for 5 years. There's about 2,500 Julia packages, with the ability to call C, Fortran, R, Python, Java, etc. All the key community stats based on downloads, website views, videos show a healthy growth every year. While in absolute numbers, we may be at 20% of R or Python communities, I am always curious to understand what people mean when they say the community is too small. What would be a signal that a particular community is big enough?