Do you know what? As much as I love homebrew on the DS, I find I'm using it less and less for that.
I mainly play MarioKart DS.
The biggest homebrew use for me was the C64 emulator of which development is as slow as continental shift

....so it's never become as polished as it could've become.
Doom 2 is the only saving grace and most of the other homebrew I'm just not using enough.
Even the arcade stuff is being used less often.
For movies/videos I use the iPhone, books - the iphone, mp3s - the iphone, er..... telephone calls - the iphone

.
So if I wanted to pursue homebrew even more, there are better alternatives out there (e.g. Dingoo for arcade emulation).
With the above in mind, Nintendo has done the only thing it can imho. It needs to stamp out piracy and if this is what's needed then so be it

.
I can certainly live with no multimedia capability and only games as I have other things for the audio/video side.
It also hasn't stopped me being first in queue for the 3DS

.
I'm pretty sure determined pirates will always try and find ways to circumvent anti-piracy so an outright ban was inevitable...let's see how it develops (if it improves the software library both in scope and size (which is already great) then I'm all for it).