I would say a home NAS is the main reason for wanting more than 1Gbps today. Think 10 years from now when you have a home NAS with 20TB of SSD in it and you want to either back something up to it, or using it like a local disk. 1Gbps ethenet is not going to cut the mustard, and neither is 2.5Gbps. At that point you will be cursing and swearing you cheaped out on Cat5e.
I do admit I am rather scared by my father who constantly used to say that will do we will be moving in a couple of years. Some 40 years later my mother is still living in the same house.
I know you're talking ten years from now, but if you want to make a home properly future proof, why bother with ethernet? Have fibre optic runs installed instead.
How many 'domestic' devices are likely to support 10Gb ethernet interfaces in ten years? What about NAS units? At the moment it's a vanishingly small number. Yes, that will change, but I'm not convinced that 10Gb is going to have any relevance for an
average home user any time soon.
Most home user devices are connected wirelessly and you rather lose the advantage of having 10Gb ethernet if you have to move files across the airwaves.
Even if you have devices hardwired, it's not always the wire speed that limits the rate at which a backup completes but the rate at which the backup software process the files.
The average home user doesn't have
any installed network wiring and has wi-fi from their ISP's supplied router. Even 100Mbps hard wired ethernet would be an improvement for many.