Didn't the Tardis explode in The Big Bang?
It exploded at the end of The Pandorica Opens right after the Doctor is forced in and The Pandorica closes.
What I'm trying to answer is what caused it to explode? Are we to believe that the Silence somehow snuck into the TARDIS and caused it to explode? Neither the Doctor, nor River, ever leave it unlocked, or the door open, so how did the Silence get in to blow it up? I don't think so.
I think Rassilon started a countdown in the TARDIS, likely once the Doctor shot the White Point Star and Rassilon knew his plan had failed. If he can throw the White Point Star out of the Time Lock to Earth, then starting the countdown to the TARDIS exploding is certainly within his power.
It's also within the character of the man in The End of Time and it advances his plan. Remember, he wanted the collapse of all creation and time to initiate the Ultimate Sanction. If he couldn't get it by bringing Gallifrey back, then getting it by causing the Doctor's TARDIS to explode would have been just fine by him.
What he didn't count on, nor could ever count on, was River Song being in the Control Room at the time of the explosion. I think the TARDIS had a vague idea of something going on and that it was going to happen on June 26, 2010, but she didn't know exactly what was going to happen. She tried mightily to avoid landing at Amy's house that day, but River forced her to. Once River then took off again, the TARDIS worked out what was happening and when she landed, she landed in such a way so that River couldn't get out, which was the only way the TARDIS could keep herself alive.
Anyway, the cause of the exploding Tardis is another dangling plot point left by Moffatt.
You're probably right, and mine is probably just a typical crackpot theory of mine, but I like it. I think I just closed the plot point. :smilewinkgrin:
I think he finds the crack in time useful as a place to stuff his unresolved plots.
I actually think he used the crack in the universe brilliantly.