Anyone who thinks Surefire is going away doesn't know how reality works, or is trying to push a competing product. The reason SF isn't popping out new models every week with the latest in-fashion parts is simple. It's hard and expensive for a "real" company to go through the R&D, production line changes, parts sourcing, marketing, and shipping steps. Before releasing a new product you have to be absolutely, 100% sure that it's totally reliable (in SF's case since lives might rely on it), can be mass-produced without problems, that you'll be able to get components, and most importantly that you'll be able to sell enough to make money. If these factors can't be almost assured then you don't sell it to the public. I think they dropped the ball on the U2 design and that probably cost them a lot in customer service and sales.
Think about Mag Instrument for a minute. They're still around and they come out with fewer new products than any premium flashlight maker. They took forever (too long, really) to come out with an LED light because they couldn't shift such a massive manufacturing operation around market fads. They needed to be sure they had everything lined up correctly for probably 5 years into the future in order to make it worth while.
Speaking of Mag, they come out with a new product around every 6-8 years on average, and they have very little "enthusiast" respect, and they're doing pretty well for themselves. Surefire is so much better, a more agile company, and they make a lot of things no one else does or will any time soon. They also have much better quality and support than the Chinese no-name outfits. They're here to stay.
One thing I don't like about SF, though, is that they seem to put an inordinate amount of effort into making one-off prototypes that have no hope of getting produced, or will have such a limited interest (like the Titan), instead of improving their core product line (see U2 switch) and lowering prices. I'm sure the original R&D cost for a 6P was covered years ago and there're only pennies worth of machining in that thing.