Additional property taxes on land near the stations would be a good source of revenue. It's likely that the adjoing land commands higher rents due to proximity to transit, and it's rational that some of this extra revenue goes towards maintaining the transit that is its source.
I don't think any long-term conclusions should be taken from the data he uses. The 2008 data basically captures the market downturn, and the 2009 data captures the recent bull market. It's not really representative of larger trends.