The future of Linux32 builds and tests

We recently disabled Linux32 talos testing on all trees. 

Going forward, the question remains, do we need to run Linux32 tests at all?  This would reduce the complexity of our configs, as well as significantly reduce our AWS bill. Do the linux32 test results provide significant differences from the ones we run on on linux64? I see three options going forward

1) Run linux32 builds and tests periodically
2) Turn off tests but run the builds and make it a Tier 2 platform
3) Turn off Linux32 builds + tests entirely

Your data-driven input is sought,

cheers,
Kim

Bugs of note
Disable all 32-bit linux testing 
https://bugzilla.mozilla.org/show_bug.cgi?id=1209932
Do we need linux32 talos? 
https://bugzilla.mozilla.org/show_bug.cgi?id=1204920
Disable linux32 talos testing and reimage machines for windows testing 
https://bugzilla.mozilla.org/show_bug.cgi?id=1208449