Q: Doesn't the spelling aluminum predate aluminium?
A: Yes, and alumium predates both. IUPAC uses both, but prefers aluminium.
Q: I still think aluminium sounds funny/odd/jarring.
A: Someone from another country would say the same about aluminum.
Q: I have new, pressing information that leads me to believe the spelling should still be changed.
A: Feel free to start a new section and make your case, but please check to see if your point(s) have been raised in previous closed discussions.
Q: Are you people seriously arguing about a single letter 'i'?
A: Yes. Alternatively, no. It depends on whom you ask.
Q: How about a compromise with alumin(i)um?
A: A house divided against itself cannot stand. (For those unfamiliar with US history who may not understand this, see Lincoln's House Divided Speech)
Q: Would searching for "aluminum" not turn up results effectively giving priority to the British spellers over the American spellers?
A: No, because Wikipedia provides a redirect to the correct article and most search engines will be able to recognize (or recognise) alternative spellings.