The 7950 can mine litecoins and other coins. So even when ASICs did finally get shipped, GPUs by then had a work-around in place to extend their profitable life.
So again just because marketers claim one thing will be obsolete in two weeks does not always mean they are right.
By the time the two weeks rolls around, especially if it turns out to be a lot longer than two weeks, things can change.
Some private farm could be about to turn on massive numbers of already-built 28nm chips, we just don't know and cannot know.
But historically the FUD-trolls claiming in "two weeks" this that or the other old tech would no longer make profit have been wrong.
We wasted a year not buying mining gear because in "two weeks" BFL's superior product would arrive.
We wasted how much of what thinking Avalon would ship chips in 8 to 10 weeks.
-MarkM-
When BFL began the "two more weeks" campaign back in fall of 2012, there were zero ASICs in the market. It wasn't until early 2013 that Avalon and ASICMiner began to deliver. Since that time, we have seen BFL actually deliver some product and Bitfury roll out a lot of chips to their customers. KNC and CoinTerra also look likely to deliver some product.
It is therefore very unlikely that the hash rate will stagnate like it did in the fall of 2012. In fact, BFL could stop delivering completely and it probably wouldn't dent the growth rate.