In my opinion, this bug should be upgraded from wishlist and retitled. There is a real need to scan for btrfs filesystems later than at the initramfs stage, because of devices that don't exist yet at that point. That includes not only actual hotplugging of the hardware, but also late-open cryptsetup and lvm devices, and other things that come up late like network block devices or complex HW-RAID setups. As a specific example, two-disk btrfs over dm-crypt fails mount -a even with initramfs, because the dm-crypt devices don't exist during the first and only scan. Initrd-less boot should be supported as a side effect if you have udev trigger btrfs device scan.
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