Thing is, I actually got an idea that a young man discovering and salvaging a TARDIS in this way, and doing exactly this. However... this person is much less conservative about how much he changes the past and how much power he can extract from the TARDIS. I imagine him and The Doctor actually being opponents.
This person wants to change the universe, and knows within the TARDIS is the power to do it. (IE what Rose did), but knows it's dangerous. So he seeks power elsewhere.
The Doctor may tell him "You're just a human, don't do this to yourself!!" if he were to come into power, but he would reply
"Doctor... I am far more than just another human..."
Me and my overactive mind.
I've imagined him as looking like me, though I certainly wouldn't do anything that he would do.