Eh..........not necessarily. Most "big box" machines come with limited hard drive space. 80-120gb isn't much, and most people don't want to open their boxes to install a new drive, or pay someone to do it. It's much easier to go buy an external drive, plug it in, and rock. I see the external market growing over the next few years, and I see the price on external units coming down even farther to match the demand. Today, you're looking at 50 cents per GB (give or take) for internal, and over double that for external. I see the margin closing to a more realistic 50 cents per GB internal, 75 cents per GB external. I mean, really, an external case is cheap, and with the new perpendicular drive tech out now, WD, Seagate, and Maxtor are gonna be looking hard for ways to dump their old "regular" drives fast. Enter cheaper external drives.
Remember, we're not talking laptop drives, or drives people will carry around. We're talking about no-brainer storage expansion for home users.
Mark my words, it'll happen.