Yes and no. You do run into thermal limits, but you can control how much power you draw by adjusting voltage and clock speed. Somethings are more "transistor" h

Yes and no. You do run into thermal limits, but you can control how much power you draw by adjusting voltage and clock speed. Somethings are more "transistor" hungry than "cycle" hungry. That said, I expect the early uses might be in mixed mode (linear and digital devices in the same package) and things that benefit from a huge cache or pre-programmed ROM. There are also things like diamond substrates that improve the thermal transfer characteristics as well which helps you to draw more heat from the package than just silicon. This was a feature of "silicon on sapphire" processes and perhaps we will see some "silicon on diamond" parts.