Originally Posted by EternalMaster
Loki mocks Thor when they first meet, saying that Thor must love that Loki got the Teresect because it created an excuse for Odin to exert a lot of power just to send Thor to Earth. He even asks how much dark energy did the All-father need to send Thor now that the Bifrost is destroyed.
So that shows us that getting to Earth is a big feat even for Odin without the Bifrost, and sending Thor was done only to capture Loki and the Teresect. As others have said, it was made clear that the Teresect could open portals, so once Thor had it, he could get back to Asgard easily.
And with the Teresect back in Asgard, Odin can no doubt fix the Bifrost or at least send Thor to Earth more easily... for Thor's sequel no doubt.
We have a winner! Give the man a prize!