I think this is it exactly. The pace at which infrastructure, support and tools in "competing" ecosystems can be improved will outpace the rate at which people's miss can be changed about JS. There are 10-15 years of the language's, most of which were a Very Bad time for it's reputation, and only recently has the community of developers begun to land on solid development principles -- and you can hardly call those universal. I think most people fear callback spaghetti when they think of diving into someone else's JS code.