I agree that giving digital rights to print may be problematic. However, many people need them for digital use, such as websites and online promos.
From a thread I created which is similar to this thread, I've come to two conclusions.:
(1) Never give away print rights.
(2) If you do give out print rights, make sure you stipulate in contract specifically what they are, such as web usage only, one time print, size, whatever you want to control.
Remember too that with digital, it's a whole new ball game. People are going to want digital rights to use online more and more. Thus there must be some conclusion. There is a lot to think about.
For example, if you are hired to do a family reunion, or even a wedding, you can be pretty sure those images are not going to be reprinted and sold for profit. As a precaution, you may want to list usage rights as "no profit use" or other tag.
Also, if someone prints one of your images and it looks like crap, you get a nice reputation as a hack.