It's on the list. From what I understand—in addition to needing to overcome the hurdle of gaining traction over more established languages—the catch is, lack of marketing, smaller ecosystem and community, and limited backing etc. Heres what the community survey says:

"Approximately three quarters of the respondents use Nim (40% frequently, 36% occasionally), while the remaining quarter is divided between people who never used Nim (7%) and people who stopped using Nim (17%).

Of those people who don’t use Nim, the most frequent reasons are: 'Nim seems immature, not ready for production,' 'Nim doesn’t have libraries I need,' 'Nim doesn’t have enough learning materials,' and 'Nim seems too risky for production,' in that order."