I fear it might be too little, too late though jsc. The damage regarding the credibility of the Goa'uld System Lords has already been damaged by the Writers and producers in their desires to gratify the human need for humans to be strong characters with a sense of honour. Realistically they know that most of the fans would not accept the idea of their human heroes getting their butts kicked, even once in a while. And before there is a mewling outcry from anyone else about SG1 DO get their butts kicked sometimes. Well, yes, they have come fairly close, but in all honesty, they have the devil's own luck in getting free usually. In reality one of more of them would be dead by now and replaced by BCR's (Battle Casualty Replacements)
That fact is that they have shot themselves in the foot earlier in the other seasons by cariacaturing the Goa'uld instead of maintaining that air of menace and mystery they originally had. Now the viewers of Stargate are nochalant and blase about this seemingly highly deadly enemy. The Goa'uld have turned into a joke and the series has turned into a space opera. The Fifth Man did try to go some way into correcting this (I won't give details for those who have not yet seen this), but again I fear it's too little too late, and I still maintain that this show has turned into a 'SG1 kicks butt' or 'SG1 kicks butt against all the odds', farce.
They are obviously trying to pull it back from the brink of incredulity, but methinks that the new System Lords would have to be VERY menacing and convincing indeed in order to redress the balance a little. And quite frankly? I think the need of Stargate production people, writers etc to have SG1 'coming thru' against millions of Jaffa yet again, will hold sway over anything else.
I wish I could feel otherwise, but so far, even though the episodes have been well done and well written, there is nothing in Season 5 to indicate that that wonderful concept of exploring, finding out about earth's origins and amazingly mysterious history is going to take place any time soon.
Oh well, back off the soapbox!