I want to make a statement that I think we should go through the Desert Gate.
However, in the wiki page, the gate was created by the order of Queen Jennah because of the dark events beyond the gate. The guard by the gate, when you talk to him, explains that passing through would condemn us to death.
However, I think that after the fact that we (as players) killed Zhaitan, a few champions, fought gigantic Karka, defeated the Molten Alliance, and stopped a mad Sylvari who scampered across Tyria (Scarlet), whatever is beyond the gate shouldn’t stand a chance against us.
What I really want to know, is why is the Queen afraid of what is beyond the gate? If we’ve defeated so many big enemies, why are we continued to be barred from adventuring into dangerous territory?