This is essentially the theory of multiple discovery (https://en.wikipedia.org/wiki/Multiple_discovery), as opposed to the heroic theory of discovery (https://en.wikipedia.org/wiki/Heroic_theory_of_invention_and...).

Additionally, I think the "inevitability of discovery" is more true now than it has ever been. In the early 1830s there were relatively few young naturalists and geologists looking at the islands and species of the south Pacific that were well positioned to develop a theory of evolution by natural selection. Today, looking at comparable questions, there are a great deal more young scientists competing to answer those questions.

One thing that I think the original comment and this response both point out is that we as a society could still do a much better job of encouraging young thinkers towards challenging and meaningful problems, despite the fact that we do a much better job of it relative to the early 1830s. This encouragement influences not whether the problems get solved, but how quickly.