Much needed explorating and technology of Atlantis(SPOILERS)

[dd78matt]

We also find out about the timeship created by the Ancients. Most likely though, something will happen that will cause the Atlantis team to feel that it must be destroyed.

I believe in the spoiler it is stated that the ship is shot down by the Wraith, so it is damaged. Then the Ancients ban tampering with the space-time continuum. Not to mention it has to be left there for SGA to discover it, which probably explains why Weir freezes herself instead of using it to get back.

Also, i don't believe this is a way to write out Weir, considering the fact that she appears in future episodes.(based on spoilers)