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Building a x86/ARM/RISC-V desktop or server class CPU core is more about the microarchitecture.

And RISC-V is an ISA, which is a part of the architecture not the microarchitecture.

"Ecosystem" here refers to: the compilers and tools, supported OS, the suggested ISA extensions, the research movements who work and experiment with it, and so on.

Wishfull thinking that RISC-V will take off and not be uncumbered with proprietary extensions.

"Growing" is a trend, first derivative, not today's snapshot. It's starting from embedded, both MCUs and Linux-capable MPUs, and already completes pretty well there. Desktop and server will take time, like it was with ARM too.

I was interested more in "rapidly" part.

Well, what I can see in embedded area is that quite recently a lot of interesting (chinese of course) RISC-V chips have appeared at price points where ARM ones can hardly compete, especially given the never-ending chip shortage