Actually thinking about it...
If you look at your typical business software, like CRM systems, it's already amazing what kind of crap many people endure. I mean I once worked at the archive of a hospital, and if the e-mail program and the archival software would have been scriptable, half of my job could have been automated.
So yes people will probably use their cellphones for that... even if it just means scratching paper with a corner of it to leave marks.