Larry has talked extensively about how free WiFi in hotel rooms is a necessity these days. Wireless internet lets travelers work from anywhere – like the comfort of their own bed – instead of being deskbound. As well, tablets, which are rapidly growing in popularity, run exclusively off WiFi (or 3G). For a more convincing take, see Larry's previous article here and his followup argument here.
As for now, eHotelier.com has published another article today on the issue, specifically about how 4-star hotels offering free WiFi to guests are outperforming 5-star hotels that do not offer this. It's a localized case study that reveals the true importance of having free wireless services in all your rooms. To read the article, go here.