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But if we do it at all, I doubt we'll be doing it for very long, as various models of biological and nanomolecular computing are looming rapidly in view. Rather than plug a piece of hardware into our gray matter, how much more elegant to extract some brain cells, plop them into a Petri dish and graft on various sorts of gelatinous computing goo. Slug it all back into the skull and watch it run on blood sugar, the way a human brain's supposed to. Get all the functions and features you want, without that clunky-junky 20th century hardware thing. You really don't need complicated glass to crunch numbers, and computing goo probably won't be all that difficult to build. (The trickier aspect here may be turning data into something brain cells can understand. If you knew how to get brain cells to manage pull-down menus, you'd probably know everything you needed to know about brain cells.)
Our hardware, I think, is likely to turn into something like us a lot faster than we are likely to turn into something like our hardware. Our hardware is evolving at the speed of light, while we are still the product, for the most part, of unskilled labor.
But there is another argument against the need to implant computing devices, be they glass or goo. It's a very simple one, so simple that some have difficulty grasping it. It has to do with a certain archaic distinction we still tend to make, a distinction between computing and "the world." Between, if you like, the virtual and the real.
I very much doubt that our grandchildren will understand the distinction between that which is a computer and that which isn't.
Or to put it another way, they will not know "computers" as a distinct category of object or function. This, I think, is the logical outcome of genuinely ubiquitous computing, of the fully wired world. The wired world will consist, in effect, of a single unbroken interface. The idea of a device that "only" computes will perhaps be the ultimate archaism in a world in which the fridge or the toothbrush is potentially as smart as any other object, including you, a world in which intelligent objects communicate, routinely and constantly, with one another and with us.
In this world, there may be no need for the physical augmentation of the human brain, as the most significant, and quite unthinkably powerful, augmentation will have taken place beyond geographic boundaries, via distributed processing. You won't need smart goo in your brain, because your fridge and your toothbrush will be very smart indeed, enormously smart, and they will be there for you, constantly and always.
So it won't, I don't think, be a matter of computers crawling buglike into the most intimate chasms of our being, but of humanity crawling buglike out into the mingling light and shadow of the presence of that which we will have created, which we are creating now, and which seems to me to be in the process of re-creating us.
In William Gibson's classic 1984 novel Neuromancer, characters jack into the matrix by inserting "microsofts" into their skull