Does anyone know if this script will continue to have a future or is it DOA and being replaced by another component? I use its functionality a lot and would like to know if there is a better alternative or what the future holds for it...
To clarify, I'm talking about the async loader features in start.js.
None of the ASP.NET Ajax Library (not to be confused with ASP.NET AJAX) was officially released and development on it ceased before it was complete. You shouldn't use it. I've wrote an article on the subject.
The same team at Microsoft has produced a new script loader, DeferJS, which is the next logical evolution of Sys.require. You can find the latest version of it here: https://github.com/BorisMoore/JsDefer