-* Flag-day to get all hosts on "merged `/usr`", through a base-files version; probably in buster+1 (bullseye)
-* Disallow "merged `/usr`", let users who ran `usrmerge` on their own
-* Let Debian converge to a situation where non-"merged `/usr`" Debian hosts are equivalent to symlinked "merged `/usr`" hosts; do this through upgrading all packages shipping files outside of /usr (but exceptions) to stop doing this. Could be achieved by setting policy for buster+1 (should) and buster+2 (must), or maybe even shorter. This would make the symlink "shortcut" migration redundant.
-* Support both "merged `/usr`" and non-"merged `/usr`" systems forever: this implies that our packaging tools need to either support countering effects of "merged `/usr`" (e.g. through manipulating PATH for builds to detect files only in their .deb paths) or identifying tainted packages, and letting installing users decide (warn or error out at install time).
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-Given the tests from the reproducible builds' initiative, it does not seem impossible to enforce that official Debian packages support being built on either "merged `/usr`" or non-"merged `/usr`" systems; however, due to Debian being upstream to many other distributions, and due to `.deb` packages (which often don't go through the same level of checking and policing as official Debian's) being built by Independent Software Vendors (ISVs), our users will probably face similar problems to what we have described.