My own make-or-break issue is voter turnout. Despite a marginal uptick last time, the number of people disengaging from politics and tuning the whole thing out has been increasing for years. When just over half the eligible voters are bothering to take 15 minutes out of their day to vote, we've got a problem.
STV seems to maximize the value of the vote. Listing several preferences on a ballot, rather than going all-or-nothing with one candidate or another, might hold some appeal for voters.
And both camps seem to agree that the different system would open the door for more parties. If that shakes up establishment politics, if it freshens up the game and brings more people into the political sphere, then it's worth giving it a try.
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