I assume you’ve seen this tread.
I’ve looked at all the major alternatives and still find Aurelia to be the best. Unfortunately, we all know that the best doesn’t always win out in the marketplace because there are other factors at play. I think the core team has identified many of the issues that have held Aurelia back and are actively working on them for vNext.
One of the biggest issues I’ve seen is the general lack of knowledge among developers trying out Aurelia. It is obvious to me from the questions that are asked on StackOverflow that a fairly large percentage don’t even understand concepts as basic as MVVM.
I also think Rob’s (@EisenbergEffect) Beginning and Intermediate webinars from 2016 that are available on Vimeo for a fairly hefty fee should be viewed by newbies interested in developing with Aurelia. At least the basic one should be free. I think that could help adoption in a big way.
Also, completion of Aurelia-UX v1.0 would be a huge boon!