I said they were obsolete, not that they were going out of business! Blackberry still did ok for a few years after the iPhone came out, too.
The Pebble does still have a few advantages. If you require low cost or long battery life, then the Apple Watch isn't for you. For that reason I'm sure they'll continue to sell. But the Apple Watch will probably sell more units on its first day than Pebble have ever sold!