One point that I didn't emphasise in the article, and maybe should have, is that those locations where f2fs writes to fixed addresses are all at the start of the device, the same region that a FAT filesystems uses for the "FAT" (File Allocation Table).
As the FAT is also updated by writes to fixed addresses, that part of the device is often optimised for that sort of access pattern.
So if you manage to align the "meta" area to the "fat"-dedicated area, and align the sections and zones as already described, f2fs should be fully optimised for the device.
As for whether we'll be stuck with FTL for decades: that is really a question of economics. For a better product to appear, there needs to be a big enough market.