Apple does a pretty good job of this, no?Job of what? Locking up secrets in a box?
How many days out of the last year was the iPhone not jailbreakable without even opening the box?
And to be fair, the Dreamcast was about as open as a 7/11, but that didn't fair too well for Sega.
A. Reality does not owe us a successful business model. Thus even if we accept Sega as an example of a failed open console, it says nothing to imply that a closed-console model is a viable idea.
B. Disbelieving (A) is usually a quick route to failure. Apple is good at getting its customers to accept unreality, but does a pretty good job of understanding the reality for itself. (Perhaps this is why they react so violently to cracks in their reality distortion field.) Often companies begin to believe their own reality distortions with disastrous results.
C. The vast majority of businesses fail anyway and the console industry is particularly competitive. Like Nokia in reverse, they recognized their own ability to make a business out of hardware systems and remained alive in a different market (hedgehog simulator software). If they knew they were the weakest player in a market that would only support a limited number of systems, would a more-closed architecture really have saved Sega consoles? What if they had started making open-architecture DVRs or home theater PC boxes instead?