More of a general observation than something directed at you in particular: back in the 2004-2005 timeframe, I saw a cohort of developers thinned out by the jump from ASP/VB6 to ASP.NET/C#. They made similar arguments (mature framework, lots of documentation, de facto standards, also lots of FUD). Microsoft appeased them with VB.NET,and made soothing noises about them not being replaced.

I suspect that the move to the current JavaScript-heavy ecosystem killed more careers.

WASM represents another potential shift. If one wants to survive, one has to prepare for these shifts, and not emotionally invest in a particular tech stack.