"You look Time Lord."

Actually, the TARDIS doesn't have a human body and it was made clear the body of Idris was dying. Which is why I phrased it as "House and TARDIS couldn't co-exist."

Some may say it was done before: But why couldn't have House and TARDIS change places. Yes, he would have been in Idris' dying body, but it worked for Cassandra.... She was able to accept her death.

TARDIS has always been a 'her' all the way back to the 70s ;) But you have a point about her missing her sisters. It was made clear when they looked over the TARDIS graveyard. My own head canon is that all TARDIS are linked at a level that is much deeper than a TARDIS and her Time Lord are linked (Any TARDIS/Any Time Lord). TARDIS has been my favorite character since the 70s, so I have quite a bit of head canon about her :P It's nice to see a healthy chunk of my head-canon is now 'official canon.' I digress. I still think she might have learned something from the Doctor in all those years together, and why not push House into the dying body of Idris?

I thought about that... didn't write about it, but the first time I watched the episode, I was quite upset with what happened to Idris. Nearly stopped watching the show that first time. But yes, the "Asteroid House before the Doctor's Arrival" leaves a lot for fans to toy with.