First of all, yes, if you want the updates and errata WotC publishes every few months, then you'll need the internet at some time to get access to them. This is pretty much a given, since that's how they publish their updates; much like it's impossible to patch any computer software without internet access, I don't see what else they could do.
However, you don't need the Character Builder at all to make a character - all the information to do just that is available in the books, and all you really need is 30-60 minutes of time, a piece of paper, and a pen. You are free to download the rules updates and incorporate them into your character building process without any digital tools - hell, this is what several of my players have been doing since the beginning. Likewise, you are free to completely ignore the updates, and just do as you always did.
What you see as a requirement, a need, is simply a convenience which has become so deeply ingrained in your character building process that you feel like you can't do without it. It's understandable, because the options for each character can be a little overwhelming, and I myself have refrained from making anything too complex by hand when I didn't have the tools available. But it's still a convenience.
Personally, whether or not I'm gonna go back to browsing books and using printed updates depends entirely on the look and feel of things in roughly two weeks from now. If the new tools disappoint me, I'll be going back to doing things by hand. But claiming it's necessary to be able to play the game is really rather hyperbolic.