I do know that some SDK members had traded in their DSis to purchase 3DSes. However, most users who already had the DSi before the 3DS was released still have it. Every week there are also new DSi owners who choose to purchase the DSi rather than the 3DS, subsequently finding and registering on this site (alts aren't the sole source of growing membership). Furthermore, existing members with the 3DS, who may or may not still have DSis and/or remain occupied with the 3DS frenzy, tend to continue frequenting the website via computer, iPod, smartphone, etc. Because as we know, SDK is admittedly addictive.
@drwho ...And? Essentially anything can be addicting to a person.
I don't think a noteworthy number of users are unable to view the site despite the 3DS' lack of a web browser since they can simply access the website through another web-enabled device.
It's my job to help the next generation, and set a good example for them. And for that I'll gladly lay down my life.