---------- Post added at 11:05 AM ---------- Previous post was at 11:05 AM ----------
Or may be the world in Naruto verse is passing from its second millenium only
if somebody ate my fruit I'd be pissed too. It'd kind of be like my baby who's not born yet and is still in the fruit stage. If you get what im saying
Supposedly the tree bears fruit every 1000 years.
Now, there was only one God tree.
The fact that it says every 1000 years, suggests that this has been done before.
Therefore there are 2 possibilities.
1 - the fruit's purpose (if it has one) is not to give birth to a new god tree.
2 - the god tree was destined to die and 'give birth to' a new god tree through this fruit.
If 2, then the tree could be annoyed that it is being forced to live longer than it should as it can not pass on its life/chakra/power to its offspring.
If 1, then there must be some alternative reason, I wonder what that is.
I think that it is likely to be 2. This would help explain why the fruit was so full of chakra - perhaps the tree passes more and more chakra into the fruit until there is none left in the tree and it dies. As the tree was still 'alive' when the mother ate the fruit, she obviously didn't get the tree's full power.
It is possible that there was a long delay before the Jyuubi was made (or perhaps the Sage grew up in a society where the Jyuubi was constantly raging?) and this could be explained with the tree trying to build back up it's chakra reserves so that it could summon the Jyuubi.
By sealing the Jyuubi inside himself, the Sage got the tree's full power and was then powerful enough to split the tree up and remove its power.