&gt; That $15 billion is going to have to come from somewhere.<p>While governments may tend to think that way, it&#x27;s ridiculous to assume that once they have a source of revenue it must never go away.  That $15 billion could just <i>go away</i>.<p>More to the point, they already don&#x27;t currently derive that level of revenue from taxi medallions; those medallions have already been sold.  So the only question is whether they try to invent a new source of revenue by adding targeted taxes on something that isn&#x27;t currently subject to targeted taxes.