First of, the Razer Switchblade is still a concept idea, the videos I've seen of the prototype lags in Warcraft 3 and the touchscreen isn't all that responsive.
As to what happened to the Razer Mako and Barracuda? Razer is one of the most popular brands for gamers, but the fact is your average gamer won't pay $400 for a 2.1 Audio system, even if it looks cool and functions really well, they much rather spend money on a $100 headset and be done with it. Same thing with the Barracuda soundcard, fact is a lot of gamers don't want to pay for products such as these, and due to low demand Razer stops producing them. So I doubt Razer will venture back into those markets, since they realized from their previous ventures that gamers don't want those products.