Vivado already supports Linux, the development is supported by very large customers that put FPGAs in cars, [REDACTED], and other kinds of objects that crash into other objects.
AMD has been unable to not snatch defeat from the jaws of victory for ages. I'd almost say someone high up is getting kickbacks from their competitors.
As for hobbyists, in the world of $0.03 microcontrollers, strong competition on the low end from Chinese manufacturers, and where few people learn HDLs, is NRE money in the hobby market really money well spent?
I'm a HW designer and even I use microcontrollers now for most things, but not everything, because it's usually cheaper and faster.
With semiconductor prices coming down as far as they have I think the world has probably fundamentally changed for FPGAs and the niche they occupied is shrinking fast.