Nah, I'm still just discovering the GBA library via my faux wood paneled GBA SP, so 3DS is a ways off for me. However, it DOES look like the ultimate DS, so I'm glad I held off on the previous models. I'll probably get into the 3DS once SEGA has more offerings.
GBA = GB, GBC and GBA
3DS = DS, DSi, 3DS
Sounds like a nice combo.