I agree about not being able to unbrick it ourselves is an issue.. but it doesn't make it less future proof IMO.
Having an active community helps.. but with android/nvidia in it, we/I can 'piggy back' on other groups for info ie shield, ouya, other T4 products.
As you may or may not know, there are very few pieces of technology that have stood the test of time.
I can name a few from personal experience here:
MS Windows XP
Nokia N900 & Maemo(native linux)
The mojo & CTRLR are so versatile, I'm sure I'll still be using it well after it's product lifecycle... that's future proof!
The Mojo IS a cool system, I have never said otherwise in regard to the hardware. But I honestly cannot say that it will stand any test of time...sadly. It is a flash in the pan as compared with the likes of the other items you mentioned, *especially* the C64. It almost feels like blasphemy to put the two in the same sentence
But, Mad Catz could definitely redeem themselves if they became a little more proactive in the area in which the system's target audience resides. Namely HERE, and in other forums concerning Android TV boxes. Maybe some of there techs can get involved in conversations, provide useful tips, and check with their senior technicians regarding in depth questions that we may have. As it stands now it is a ghost town. I wonder if the Mad Catz employees read these forums and chuckle at what suckers we are for buying in. I REALLY hope that is not the case.