I agree, I'd like to see a lot of these single carded down the road as well, and hopefully we will. When we get SA, "ultimate" versions of the main characters - whether it is in the VTSC, Evolutions or even basic line - I sometimes like to pick up an extra, so I've been on the fence with what to do with these recent Evolutions sets. I'll probably pick up another Fett set if/when I see it, because I like the Boba and Jango (and the Mando figure is actually a pretty nice figure), and I'll wait on the Qui-Gon.
I've said it before, but I wish figures like this is what they would release in a Saga Legends assortment. They are fine in the basic line as well, but if they really want to have the main characters out there all the time, I wouldn't mind seeing a lineup of some of these:
VOTC Han Solo
EB Chewbacca
VOTC/Evo Boba Fett
VOTC Stormtrooper/Snowtrooper/Biker Scout
Evo Darth Maul
Evo Emperor Palpatine (maybe like the upcoming Order 66 paint apps)
Evo Anakin (AOTC/ROTS)
Evo Jango Fett
ROTS Obi-Wan
Evo Qui Gon
VTSC Luke (X-Wing/Bespin)
Evo Vader
R2-D2 (R4-G9 repaint)
Saga Legends/Clone Wars AOTC Clonetrooper
etc., etc., etc.
Obviously, there are others as well, but just a few off the top of my head. Like I said, they could just have them in regular assortments as well for all I care, but I'd just like to see these figures available in the basic line.