Samsung may end SATA SSD production soon

Samsung makes fast expensive storage but even cheap storage can max out SATA, hence there's no point Samsung trying to compete in the dwindling SATA space.

Does this mean that we'll start to see SATA replaced with faster interfaces in the future? Something like U.2/U.3 that's currently available to the enterprise?

The first NVMe over PCIe consumer drive was launched a decade ago.

It's hard to even find new PC builds using SATA drives.

SATA was phased out many years ago. The primary market for SATA SSDs is upgrading old systems or maybe the absolute lowest cost system integrators at this point, but it's a dwindling market.