Not sure if you looked into what Red in 8K expensive is.. But the buy-able solution is around 15K for the Red Connect adapter on the V-Raptor. Then you need a powerfull PC matching the specs Red tell you.
You need the Vraptor itself.. So you will be 50K in before you have a camera up and running in 8K. And that is without Slomo..
Wondering what BMD will do within the next 5 years since the new Cine line cameras can record up to 180fps in 8K and 224fps in lower resolutions..
And the Ursa Broadcast can do 120fps in HD.
Just a matter of time i guess there will be some camera with Quad output / IP capabilities that would be able to push those framerates to external box for slomo playout. Maybe with the use of a Hyperdeck 8K Extreme. Running 10G network into the Hyperdeck being able to play it out in slomo or something..
But who knows.. Might never happen..