Such an intriguing question, and I'm sure a lot of us are saying NEVER. That's my inclination. But once something like a cybernetic brain implant will save your life, you'll think twice. Even beyond that, imagine the competitive disadvantage you will find yourself having if those around you are increasing their IQs through a procedure like this. The societal gap that could create is hard to wrap your head around, it would be so severe. The incentive structure of something like this would be almost impossible to resist. That said, there will still be a faction that will resist. But how will the digital Amish be treated in a society of high IQ cyborgs?
The potential unintended consequences of skipping ahead in evolutionary terms are mind-boggling.