Understood, in this case it's a growth of 2x versus a set number. Doing a search for Moore's Law graph show both ones with linear growth, and others with a curved growth. It all depends on how the graph is labeled.
You're right. What can I say, it's been quite a while since my last math class. According to Moore's Law processors grow proportional, the same steady growth year in year out, so processors will grow in the next 10 years the same way they did during the last 10 years, so what makes you think there's going to be exponential growth?