The idea was that Sun becomes a designer of and licensor of state-of-the-art HW designs (which it may or may not implement). The designs come with software APIs too that different companies may want to implement.
The difficulty is that SPARC International is already a different organization to Sun. So, I don't know if they could've done this legally.
A second, interesting way, would be if Sun decided to make inexpensive SPARC desktops based on their T1 or T2 designs that encourage people to develop massively multi-threaded applications that run best in spaces where x86 boxes can't go just yet (and won't go until at least Larrabee). But they need to run and build something sexy like a Mac mini and they need it by last year or so. I doubt they could pull this one off.
As for me, I am going to stockpile Sun type 6 USB keyboards and matching mice, just to ensure my ability to have a keyboard with keys labeled Help, Stop, Again...