I think Corsair used to be the top dog, but now that they're moving into other products, they've let their RAM empire slip in profitability. However, they currently own the PSU industry, and they are moving ahead steadily in their foray into cases and CPU coolers. Corsair has changed their business model. It seems that they are profitable too. Lets see what happens from here.
Corsair will continue to survive if they keep this mentality up. They are selling great products at reasonable prices with great customer service. It's hard to ask for anything more than that.