Why would you say it’s not useable?
SSGI looks amazing in my test level as well and it has WAY lower performance impact than raytracing on my GTX 1080.
Seems pretty good to me. I’m really looking forward to the 4.24 official release of SSGI! 
I also want a technique to combine with SSGI, maybe raytracing, but I don’t like the “noisy” look of it by default…
Another alternative might be: SSGI for everyone by default.
RTXGI with high resolution/bounces settings as an option to activate in the in-game options menu for high end gaming PCs.
And ofc. RTXGI to show off the game in screenshots, trailers etc. 