It's not dying down. A quick search on AcuSport (the largest industry distributor) shows only three semiautomatic rifles in stock: the Mossberg 915, the Remington 597, and a Citadel M1 Carbine, all in .22 LR.
The foot traffic at retail might be slacking, but that's because there's no product at the moment. In a couple of weeks, stock will replenish, which will be just in time for whatever bill Feinstein's proposing to hit the airwaves.
Then it'll start all over again. It's going to be a long year.
In the depth of winter I finally learned that there was in me an invincible summer.