Ammonia systems? Maybe. With an adsorption system like the original refrigeration systems, you can drive the fluid around by the heat of the CPU but it takes a lot of heat and the system would probably be expensive. Frankly, I don't see normal consumers paying for it.
I see heatsinks being the mainstay for quite some time, with chip designers limiting performance so that the chips will be adequately cooled by normal heatsinks. Speed addicts such as ourselves will probably keep a good niche market going for better and more efficient cooling systems like water or the heat-pipe systems that Joe mentions.
Semiconductors manufacturers are getting better at thinning the backside of wafers to reduce heat resistance, and they are also going to start using different materials such as isotopically pure silicon. That's my best guess, such as it is.
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