The big Beam

Forbes has an essay by David Gelernter:

The next Web--the Worldbeam, we call it--will resemble today's Web imploded or, if you prefer, turned inside out. It will be a single global "information beam." Every Web page ever posted is in this beam.
The Worldbeam is a constantly growing journal or time line of electronic documents. Its storage is dispersed over many machines for reliability and safety, but to users the Beam looks like one structure. Like so much contemporary software, it is created by two programs working together, one on a server (or many servers) and another on your own machine; these programs allow your machine to be an "empty" computer most of the time. Information is downloaded automatically and fast when you need it, and erased when you don't.

The bigger the beam the more the users.
I fail to understand the improvement of downloading automatically (fast is something we still have to verify) and everyday the same program.
Isn't it easier to download it once a year or even less and using it when you need it, from your computer?
So much fantasy forgets that the bigger the beam the bigger the number of hackers and good ones too.
I wouldn't really like to risk permanently to infect or to give away my job, just because I belong to the "beam".