It could happen. At least, it's been suggested by the president of the Catholic Biblical Association of Hong Kong.
The jokes and puns on this abound. For example, the Pope's operating system would need to be an upgrade of redhat Linux, such as whitehat Linus (named after the second bishop of Rome).
And if you want to donate to the Pope's blogging cause, remember you can send your money digitally and securely via PaPal.
[H/T: The Curt Jester]