Nothing will happen. As only Ubuntu 17.10 is affected, no other Ubuntu-Release, no other Linux-Distribution (e.g. Arch-Linux uses libsane 1.0.27 and no extra pecularities are reported) .
Hopefully Ubuntu switches at least for 18.04 LTS back to use non-experimental libraries and frameworks.
'I have written to Brother support'
Nothing will happen. As only Ubuntu 17.10 is affected, no other Ubuntu-Release, no other Linux-Distribution (e.g. Arch-Linux uses libsane 1.0.27 and no extra pecularities are reported) .
Hopefully Ubuntu switches at least for 18.04 LTS back to use non-experimental libraries and frameworks.