Earlier quoted context omitted.
I honestly don't think 37Signals is changing the world in a big way. You're not inventing the transistor, you're making one of many online to-do lists and chats. I'm not saying the products aren't nice, they are. But they aren't gamechanging in any way. You're great at marketing though.
I'm pretty sure Rails was game changing.
Rails is just a framework, albeit a popular one. Let's see if people still use it in five years, or if they have moved onto the new new thing.