Unless it was the only way I could get an unDRMed e-book, I would rather NOT buy a bundle. All I would want would be the e-book and I would have to get rid of the the p-book. The question here would be, is the e-book considered a separate book or is it the same book? In other words, would I be able to legally keep the e-book and sell the p-book? It would depend on how the bundle is sold.
I've wondered the same with the DVD/Blu-Ray bundles being sold. Is it legal to split them? I have one but couldn't find anything in the fine print.