They will be fine mate,
not sure why you mentioned future-proof tbh, SATA IV when/if it arrives will make no difference if your SSD is only SATA III rated.

I think SATA is on it's way out, like IDE which preceded it.
NVMe connects into the PCI-e BUS, this will be the future for SSD's as it offers so much more speed.
https://www.overclockers.co.uk/sams...3.0-x-4-nvme-solid-state-drive-hd-216-sa.html