Youre assuming the Slot1's coming out are as good as they can get. They'll come up with something, and they probably already have it in their pocket waiting till everyone buys this round. The rumor is already that the M3 DS-Simply will be followed by the DS-Real, whatever that means. (Rumored to have GBA support, though I don't know how theyre gonna do that)
I almost bit the Early Adopter bug this time, and that's not my style. I will get a Slot1 card, maybe very soon, but i'm at least gonna wait and see what they really do, not trust what they claim to do. And I think I'll probably give it a little time to see what the next bog thing is ... it's not like M3/G6 and Supercard are just gonna say "That's the pinnacle" and turn the lights off for good. They'll tweak something here or there.