I'm being told more and more by Estate Agents to set all upstairs rooms up as bedrooms when you're selling your home. I usually examine the local market before deciding whether one of the bedrooms should be shown as a study or not, but I'm happy to take the agents opinion on this - they know their buyers best!
Before - a large bedroom used as a study
After, a simple transformation into a bedroom - made even easier as there was a suitable space downstairs for the study.