The patent for RSA has now been expired for a few years (since 2003)
The patent never expired. It was due to expire in September 2000; in August 2000 the patentholders released it into the public domain. Some people (myself included) think they did this in order to prevent the media coverage of patent-expiration celebrations. I was really looking forward to the party Network Associates (then the owner of PGP) was throwing, and then got cancelled.
Only people using rather old versions of GnuPG or PGP (from 1997-2000) will have any trouble with RSA keys. If they use GnuPG, they can install a plug-in that will enable RSA for them. I don't know if a similar option is available for PGP.
No; only people using OpenPGP applications that don't support RSA will have problems. This is potentially quite a lot of people. The last time I tallied it up there were at least ten different OpenPGP implementations, and some of them only support the bare minimum required.
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