You don't need cat 7. I already have a 2.5 gbe modem at my house and we regularly saturate the 1.5Gbits service. 10 Gbe will come soon and hopefully it will bring gig upload speeds to the home. It will revolutionize the internet when it happens.
That's what they said about getting megabit to homes and all we got then was a bunch of shitty web sites with huge Flash animation. Besides, unless you're storing movies on NVMe drives you're going to be limited to about 1.5 Gbit anyway while the HD writes whatever you're downloading.
Nvme drives are already dirt cheap and raid on your NAS platter drives will easily get you to 5gbit with just a few drives.
But yes, you will need solid state drives to take full advantage of the 10gbits.
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