The new standard will only apply to new-build simulators, so existing operators of existing devices can leave them as-is if they choose. There is no intent to force the new standard to apply retrospectively - per previous posts those existing devices will retain the current certification under grandfathering rules.
Whether current designs can/do support 200 degree FOV is a problem for the manufacturers. These standards have been available as a draft and in discussion for 3 years or so; so it would be rather hard to claim this was a surprise or news to anyone with a vested interest in this aspect of sim design.
