While I can be sympathetic to the article's points about too many people saying "change is bad", it completely glosses over some of the actual, problematic implications of IWs proposed scheme.
Let's also hand a little bit of blame for the internet firestorm to IW for completely botching the reveal of this info (random tidbit on a podcast, without any sort of official follow-up detailing what exactly is going on). A void of info is a perfect place for fear and conjecture, which is exactly where we are now.
Server browsers are archaic, and anybody who can replace them with something magical should be supported, but removing dedicated server support, and removing any and all choice as to who, where, and how you play the game with others is problematic for a PC user base whose communities are built around those features in other games. Not to mention, if the next LAN party I attend has any particular criteria for a game, you can bet your *** that one of them is the support for a Dedicated Server. It just makes life better. Innovate away, make the system better, but be careful how much functionality you're cutting by simplifying the interface.
Per "insular small communities" and IWs supposed "larger", all-inclusive community: bigger isn't necessarily better. Halo 3's online community is huge, and I get a great deal of enjoyment from it. But if I could be playing Halo 3, and choosing servers like I do with DoD, TF2, or BF2? I'd take that any day. The random crapshoot of "awesome people to play with" mixed with "complete d*****bags who TK for kicks" in Halo 3, since I'm part of a giant community where I can't wall off a garden of like-minded players, is not a plus.