I'm unsure. The other platforms just don't stack up.
What's more, the other benefits would still be there. App sharing. My family with iphones. Ease of putting media on, doing backups, updates when i want, etc all through itunes. The selection of apps.
Maybe i'd feel different if the next google Nexus phone has 3.0, similar or better than retina display, etc. This puts me in the unsure camp. But its probably the only android i'd consider (the Nexus S was disappointing). Unless HP/Palm totally surprises me as I have a soft spot for webOS. WP7 doesn't appeal to me.
I'm ok on 4.1 jb. If you weigh what jb gives you vs what little 4.2 gives you, then its a nobrainer. You wait.