Earth currently has no means to detect cloaked cargo ships.
And yet they did just that in SG-1's Family Ties.
Yes, I remember the finale arc from last year. I'm choosing to ignore it.
If anything is stupid about the storyline, it's that the Tau'ri haven't already been wiped out, as the LA could surely do it if they wanted to.
No, I don't think leather-clad cliched cartoon supervillains are capable of wiping out Earth. Cliched cartoon supervillains in fancy dress couldn't do it, neither could ones in prosthetics and long hair acting like vampires. For that matter, neither could ubervillains in robes and spewing religious rhetoric.
Besides, we know from 200 that Earth is basically safe until the year 2016, based on the ten years later scene at the ending.
Plus we I don't think anyone mentioned what happened to Atlantis yet so it could stil be there with it's drone supply which and if it went back to pegasus they could have always found a new chair I mean they know where at least one is and they could always check the databsed to find out how to reprogram one to work for the Antarctic outpost. Plus I have to call horeshit on the LA somehow altering their shields to defend against asgard weapons as the fracking snakes could only do that once only becuase anubis was half ascended and had access to ancient knowledge and the asgard pretty much had already advanced their weapons by the time the second wave was sent, and the LA doesn't have near the resources the Goa'uld becuase their a bunch of crooks and not a massive empire that ruled for 1000s of years and no amount of pretending otherswise will change anything, for god's sake the LA was getting their asses handed to them just by SG-1, if they try to attack earth they can just kiss their asses goodbye.