Politifact Georgia's Terry Lawler examined a T-SPLOST supporter's assertion that there can be no Plan B if voters reject T-SPLOST July 31st and found that claim mostly false. I don't think he went far enough: we can change the legislature in this election, and a new legislature can come up with an entirely different plan.
PolitiFact Georgia read the state House of Representatives bill that was passed in 2010 to allow the referendum. In the last one-third of House Bill 277, there is a sentence that confirms that point.
"If more than one-half of the votes cast throughout the entire special district are in favor of levying the tax, then the tax shall be levied as provided in this article; otherwise the tax shall not be levied and the question of levying the tax shall not again be submitted to the voters of the special district until after 24 months immediately following the month in which the election was held."
That's only what the T-SPLOST enabling legislation says. The legislature could come up with a completely different plan. How about a Plan B like the ones proposed by the Georgia Sierra Club and the Atlanta Tea Party? How about we let the state gas tax automatic increases happen and use that to fund real transportation projects like busses and trains and airports?