Eh, if we're talking implanting stupid shit into yourself, most people might be satisfied with it lasting only a few weeks. Hip replacements don't fail because the immune system kills them, though. They're worse at wear and tear than original bones. Pacemakers have to be swapped because battery. Nothing to do with their compatibility. For pacemakers, the original leads might stay in forever. Bluetooth is a bad example because that's just as non-interactive as the others. A memory brain implant that connects to actual nerves, maybe. Bluetooth would just be another box. Yeah, but I'm saying that progress is inevitable, and if we can have a 256-pixel grid, we can get up to and beyond original eyesight. Nothing to do with wishing, it already works. Example. So yeah - if you want to put in an implant that is only going to last a couple weeks, hip hip hooray.
They have a design life of about 20 years. My grandfather went through two. Atrial cardioverters? 10 years. Ventricular cardioverters? 6-8 years. That's the calculus: "Will you be dead by the time this thing fails?"
And these are simple, mechanical things. A saline sack or a titanium jack are doing a lot less than, say, bluetooth.
And so that we're absolutely lucid, that blind man would much rather have your eyes than a 256-pixel light-dark grid, but he'd rather have the grid than nothing.
Wishing doesn't make it so.