While the article and significant sentiment in threads suggest a push off MongoDB toward PostgreSQL, I do think MongoDB has its own place in the stack and that it won't be obsoleted. I've personally had many pleasant experiences working with it in past projects.
Regarding business metrics, I may have a slight bias coming from the startup world but we often value revenue the most, especially in the earlier stages of a company; we can reduce costs and perform various optimizations in the future but what stays at the foundation is whether or not there is strong product market fit such that more customers keep coming in and coming back to use the underlying product — I would say MongoDB's current growth trajectory is in line with that.
I'm hopeful overall that they can turn profitable (maybe not this year or next but eventually so).