The legacy of this mess will be with us for years. React is currently the winning framework (if you use Google search trends as a guide), and so new applications will more likely be written in React than the other frameworks. Thus, the pool of experienced developers with these older frameworks will shrink, making it more difficult to maintain these applications written just a few years ago. And no developer will want to put Vue or AngularJS on their resume when React is what is in demand at the moment, further weakening support for the older frameworks.
Granted many developers who know one framework know others, but the pressure will be one to translate, or rewrite an application from one framework to another. And that effort is expensive. Given that the business rules have likely changed since the original app was written in the mid 2010’s – it’s likely a new app in the current framework will be written from scratch. The good news I guess is since these apps only had a useful life of say 5 years, they will be easier to rewrite – but it won’t make the business person paying the bill feel any better.
It’s still early days for Blazor, as the chart above shows. But I am confident that Blazor will be the winner, and I am currently writing all new apps using Blazor. Unfortunately for the business world, I expect in a few years I will be fielding lots of requests to rewrite very young React applications in Blazor.