We had similar question already
Visits per day -- should we be worried?
I dont think you have to worry that this site get closed. SE team knows, that user number will grow with ongoing time.
Interesting to compare
So imho our stats look OKish to me
Spanish proposal will soon start and probably make SE as a language site much more popular, Japanese, French, German are likely still minorities in the language spectrum of SE users.
good opportunity to advertize
one more time ;) Please vote questinos with less than 10 votes!