Caldwell especially, you'd think would object. You'd think Rodney would be all about practical thinking, i.e. don't let your military commander let an alien entity into his head. I could see John being a closet romantic, but I don't think that would overrule 1. His need for privacy, 2. His knowledge that letting someone else take over is not a good idea. John's smart, and a tactical thinker. He wouldn't go for it.

But yeah, at least that's a better idea than the nothing the show gives us.