I would view this as a technical challenge to survive a domain name change because as you pointed out, the trademark aspect is pretty clear cut and Jobs isn't going to intercede.
Talk to some SEO gurus because I'm certain there's a best practice for doing something like this.
To go back to the Pidgin/Gaim example, it doesn't appear that they own any gaim related domain beside a way out of date sourceforge one and they still own all of the top spots for 'gaim'.
edit: another idea, post an "ask HN" about it, I'd be curious to see what this crowd would come up with.
My suggestion would be to make the post generic so that the answers can benefit others, in addition to yourself, but this could be apparent (and I'm stating the obvious like an idiot).
Talk to some SEO gurus because I'm certain there's a best practice for doing something like this.
To go back to the Pidgin/Gaim example, it doesn't appear that they own any gaim related domain beside a way out of date sourceforge one and they still own all of the top spots for 'gaim'.
edit: another idea, post an "ask HN" about it, I'd be curious to see what this crowd would come up with.