I think we are going to need more than a month to fix this. A search on
enwiki shows 26,000 pages using importScript, 7,000 pages using
addOnloadHook, and 4,000 pages using addPortletLink. (Although
addPortletLink is already aliased to mw.util.addPortletLink in enwiki's
Mediawiki:Common.js.) It would also be nice to have a drop-in replacement
for importScript before we disable it - I can imagine a lot of users
getting annoyed at having to change all their importScript calls to the
mw.loader.load syntax.
Strad