I can't imagine dropping him. He's on the 60-day DL because the treatment for what he has is 4 weeks of no throwing and then a typical spring training ramp-up of 2-4 weeks. They're taking it easy and playing it safe here. He should be back to normal before the all star break.
Hope springs eternal
grows like ivy on the vine
then dies in the fall
--Haiku for a Cubs Fan, The Loveable Losers