There's always the option that we will die off, that we are experiencing a great filter.
Perhaps we have changed our environment in such a great way that it is impossible to avoid it?
We have the(correct) climate change narrative that makes people think declining population is a good thing, instant communication and very rapid dissemination of information and tools which enable a "winner takes all" situation(which means 1% of the population has the means to comfortably raise 100 children, which they won't, while 99% can only raise 1.X children, which they are doing), birth control, anonymous and tolerant societies where it is ok to be childless(and it really is ok), pursuit of happiness(which was never a thing in human history), non-religiousness(all major religions value having children), long working hours, "good parenting"- which is a good thing for the children, but it makes raising children incredibly expensive in money and time, both of which most people don't have, the fall of monogamy, the ridiculous real estate prices, the rise of mental dissorders -- all of which lead to below replacement birth rates.
Don't count on subgroups to save the day, their higher birth rates will plummet as soon as we hook them up to our values and we free them of their oppressive values.