Cirrus has sold well over 3000 Cirri in a little over a decade of operation...so I think if it ever makes it to production (Cirrus Design ain't exactly flush with cash these days) the SF50 will sell pretty well; 50-80 units per year, almost exclusively to owner-pilots.

I highly doubt Cirrus would ever move up to twinjets...its WAY too far out of their core competency and WAY too competitive - plus there's no chute big enough!