Man, iLink's been the greatest networking I've done on any system (last time it was this good was MidiMaze on the Atari ST - 16 player 3D shooter, in 1988! Yes, that's FIFTEEN years ago!

)
Anyway, I'll certainly miss it and this makes me think that I should buy one or two extra PS2s in the near future. Though then with well over 50 million around I'm sure the old ones iLinked ones will be available somehow for quite a while.
Of course, we'll be LANning our way through games in the near future, and the LAN adapter isn't very expensive and I have a HUB for that already anyway, but the fun we're having with racing each other six-ways in GT3 in particular isn't easily matched by anything else, until GT4 comes out maybe. And let's not forget that iLink is still way faster than standard 100MBit LAN (but that's fast enough though).
Let's just hope GT4 is good enough so that it won't be an issue and that you can do anything in GT4 which you could do in GT3 or GTC, so that there's no need to ever go back, and then we'll be just dandy. I guess though that it will also mean that the PS2 can drop in price a bit, as the iLink must be more expensive and the new DVD hardware's probably cheaper than the old one because current standards are always cheaper. And it could be quite a while (if ever) before it hits Europe. ;-)