A much younger and naive self wrote this several years ago. I have the upmost respect for 37signals and the amazing team behind Basecamp. I thought it would be interesting/nostalgic to post given their recent rebrand.
I am not sure you can draw the conclusion off of your post. They are knuckling down and focusing, very different from being a 1 trick pony or not being adaptable. They are forging full steam ahead on what they know best.