Is it time to learn Blazor? For majority of developers no, I think. For those like me who just must play with bleeding edge and coming-soon stuff it is good time to jump in.
I have played actively with Blazor since version 0.3.0. I try different scenarios and use-cases to see how things work and to achieve better understanding where Blazor fits in big picture. My on-going public experiment I call BlazorDemo is simple Blazor application that is built to run on Azure and use different Azure services.