I don't think the past few years will be representative of web development in the future. The community has had a lot of churn because basic questions (How do I ensure my code has what it needs to run? How do I include dependencies? How do I efficiently deliver my code?) weren't answered, but now those questions have robust, widely used solutions, we don't have everyone figuring that out for themselves (and writing throwaway tools).

I think most of the current crop of tools that are in vogue will stick around for a while. There have been a few challengers to Webpack offering feature improvements (Rollup, Broccoli), but the ideas they introduced were added to Webpack, rather than replacing it.