Wire to a Dish

Single Wire Multiswitch setups use only one RG6 coax cable. 

That will cover for 4k and future 8k channels?

Yes. That cable feeds your DirecTV Receiver/DVRs. You'll need an HS17 or HR54 Genie DVR with compatible 4K Genie Clients for 4K channels. There are no plans for 8K. 

I dont want a Genie system. Just a handful of HR24's. does this change the amount of wire needed from dish?

I don't know if you can still get HR24s. The Slimline dish only uses one RG6 coax cable to feed a compatible SWM splitter that will connect to your DirecTV boxes. The HR24 does not support 4K. 

Thanks