For wired machines, sell iSCSI, 10gigE, and the ability to boot from the NAS (well, used as a SAN in this case.) One drive array then handles all the home files, and is easily backed up and managed.
Your understanding of "easily" may differ from most people, besides you're thinking too limited. People want access to their data on the go, visiting friends and family, at the cabin or on vacation or business trips or whatever. Sharing movies between the upstairs and downstairs TV isn't exactly the biggest problem. Even though you might hate the buzzword "cloud" they certainly want cloud-like functionality. And then you're talking an Internet-facing service with all the fun that entails.
It might be wise for EMC/VMWare to get with hardware makers and put ESXi into BIOS of computers
Almost all desktops computers are able to do decent software virtualization already, at least for a single user case. Who is really waiting for ESXi outside of enterprise servers?
SAN functionality like snapshots, copying backups on the array level, deduplication, and other tools would be useful on PCs. Malware can't touch previous backups if done on the snapshot level.
Only if it's done by another process they don't have access to, just like backup files they can't alter. They steal your credentials, so if you can delete your own snapshot so can they.
Time to bite the bullet and move to SSD wholesale, at least for the OS. HDD bays are still useful, but the machine should at least boot, if not run its apps and data from SSD.
They'll stop providing HDDs when the market stops buying them. Lack of choice isn't going to sell a lot through extortion, because unlike Apple buying their hardware isn't the only way to run the same software (Hackintoshes excluded).
Consumer level backup media. Malware isn't going away anytime soon, and there is nothing out there that actually gives resistance from malware overwriting backup media, except for CD/DVD/BD-R drives. What would be ideal would be some form of inexpensive tape drive with the media able to be write-protected, maybe even WORM media available
Except it doesn't exist. Except consumers often treat their media like shit. Except it's that manual process users never bother to do. Most can't even be arsed to copy-paste it to a thumbdrive/second HDD/NAS/whatever as backup. If you got one online backup (anywhere but at home) and a disconnected USB HDD next to your PC you're better off than 99% of the population. The chance of a fire/theft destroying your offline backup and a virus/trojan destroying your online backups at the same time are pretty slim.
You can't backup a 4TB drive to DVD-R. Or I guess you can, but it'd take forever both to do and restore. Same with tape backups, you're not going to swap ten tapes to back up/restore one drive and the kind that could back up large parts of a drive is $$$.