[Neither] SG1 nor Atlantis were failures and Cooper and Wright have a good track record. Brad Wright is the co-creator of the entire television franchise I can't imagine MGM getting rid of him for no good reason.
To play devil's advocate here, in the past three years, both
Stargate Atlantis and
Stargate SG-1 have seen their ratings steadily drop to the point that both were prematurely cancelled by the network. Yes, a 10 and a 5 year run are both quite respectable in the world of television, but the fact remains both series were cancelled expecting renewal for at least one further season. Critical attention has been non-existent. At Metacritic, there are no entries for the series or the DVD movies; at Rotten Tomatoes the number of reviews is paltry at best. The
Stargate Atlantis: Extinction straight to DVD movie has been put on hold, possibly indefinitely. And MGM has made it clear that it will not be releasing Blu-Ray versions of season box sets due to weak sales, instead only releasing ‘Best of’ sets, which have themselves been cut down to single disc releases due to weak sales.
And this is a Franchise SyFy gobbled up over critical success
Farscape, amongst other properties, six years ago.
The best thing Brad Wright and the franchise he's led have on the horizon is a series that's been repeatedly blasted by fans before they'd even seen a foot of film, and trailers have done little to alleviate those concerns.
I wouldn't wish the guy fired just yet--his writing is often the best work on the series--but if he isn't feeling the flames at this point the powers that be must be doing a pretty awful job managing things.