Anyone who went thru the Angular debacle would certainly see it from a contrary point of view. Yes there is more risk of a particular piece of the stack being wrong and needing to be replaced but the risk is not a total rewrite of your app out of something like Angular 1. Rather it is a smaller effort such as moving your flux implementation or going from gulp to webpack. I think the modularity actually helps in long term support of an application, but you pay for it in up frot complexity and contextual understanding of all the pieces and how they bolt together.