Doubtful, very doubtful, for a few reasons:That's why I don't go to McD's or BK. Just look how much Starbuck's charges for a cup of coffee - and they offer "free" WiFi. If they didn't, I bet their coffee would be less.When you go to malls, stores, McDonalds, Burger King, etc, they all provide complimentary Wi-Fi, but everyone pays for it.
1. Wi-fi is a very small part of the budget. Like, maybe $50/month, if that, plus the initial cost. They already have to have internet into the location for their registers to work, so it's just whatever extra bandwidth they need for customers over their own usage and the cost to have wi-fi and segment it off. (This is different from a train...mobile internet is much more expensive than land-based internet.)
2. Most of their cost is labor. The actual cost of the coffee is likely irrelevant to the cost that they charge.
3. Wi-fi is a selling point of many of these restaurants. If they didn't have wi-fi, they'd have less customers, which would mean less customers to spread the labor cost between. Considering the minimal cost of wi-fi, it seems just as likely that prices would go up if they eliminated wi-fi as it would be to go down because of the cost savings.