The HD consoles in general are starting to seem like they have about a two year life span, barring the ones that were made to higher tolerances.
Starting to wonder if it would be worth the trouble to design a closed loop liquid cooling system if there was a way to properly mount a pair of water blocks. Problem is even a simplified closed loop system (actually a pair) would end up costing between $150 and $200 since both the RSX and CBE would need their own.
For a console that costs $299 to replace, it really isn't worth it. The best quality TIM you can find is probably the most the average user is going to change and I'm not convinced whether that would really do the trick alone.
Only if you had a 60GB SKU and you really, really loved having PS2 BC, which really isn't worth that much trouble IMO.
I've torn apart a 40GB SKU so many times, I could probably do it by feel by now. After one fix that lasted long enough to back up the data plus about a week's game time and a few more fixes that didn't, I'm probably not going to bother doing another repair job if the current job doesn't last.