I think the nostalgia problem
I think the nostalgia problem is tricky because most people long for the old and long gone Saab, not necessarily the newer ones. After the big companies came in and scooped off the little passionate ones, they left half digested carcasses behind, and that wasn't before they "modernized" the venerable icons. So bringing back such brands make you wonder, is it the badge do they still truly innovate in their own ways?