Exactly my thoughts. Why would a well built system leak, it can be made properly.
We can still hope that Apple would invent their own system - and make it properly!
Ummm... Just in case you missed it last time:
The new trend in consumer electronics at the moment is to make everything more efficient, therefore use less power and consequently run cooler.
This also allows things to run faster yet remain smaller and slimmer, as an elaborate cooling system would take up a lot of internal space in something as compact as an imac.
A huge amount of R&D resources have been put into more efficient (hence cooler running) processors in recent years. Not only does that mean that the cpus use less energy they run cooler, allowing computer companies to make things SMALLER AND THINNER, improve battery run-time in their portables and also push the 'green' angle.
Liquid cooling systems can use up a lot of power (negating the 'green' marketing angle) and since the new chips run cooler, they aren't really needed anyway. They also take up valuable space within a line of products which are becoming increasingly slimmer and miniaturised. Considering apples previous (failed) attempts at a liquid cooled tower, I'd be surprised to see them rushing back to the concept.
So where exactly does your chunkier, less green, less reliable imac fit into Apple's current marketing strategy?