I just put in my pre-order for 3DS at Gamestop. I'm actually looking forward to it. I jumped on board with the DS the day they were released, picked up 2 of them, as well as the PSP. The PSP was priced at the same exact price point 6 years ago that the 3DS is. While I've gotten enjoyment from my PSP over the years, the DS's were almost immediately worth the price in enjoyment. I figure if I can get even half the enjoyment that we've gotten from our current 4 DSi's then the 3DS is going to be well worth the price.
My son's DS is starting to die, but after several years of abuse and heavy gameplay it's time to upgrade his. I'm going to get the 3DS and pass my XL down to him. So, killing two birds with one stone.

BTW - they already have flashcarts and DS/DSi backups working in DS/DSi mode.