From what Peacock and The governor has said. That extending the bonds would place no extra tax burden on the citizens and if that's the case I think the court is going to rule in their favor because why do you need a vote if the outcome doesn't change anything
The problem comes in that most "temporary taxes" or levies have a sunset - or ending date - that the voters actually vote on. My understanding is that the bond levy for the dome was supposed to end in 2021 - is that correct? If so and there is wording to the effect either in the ballot wording when it was passed or in the implementation wording that this could be the Governor's biggest hurdle. The reason being is that most rulings have been that the voters should expect to know precisely what they are voting on (even though most don't actually pay any attention). That is why many ballot initiatives are thrown out after they are passed if they somehow might affect more than one rule/law/statute. The courts often rule that the voters did not have a clear idea that they were voting on the additional affects. They would only reasonably know that they were voting for the main item in the title.
Others want to suggest it is the "adjacent" wording. Not sure. I've seen many projects considered "adjacent" simply by being in the same township or zone. Seems to be a stretch but they make it work if the city wants it. How close is the riverfront site to the Dome? Seems that it is practically just across the freeway and certainly in the same basic zone of the city. I suppose the locals might have more input on this thought.
The interesting thing is that I think the lawsuit to overturn the city ordinance has a good chance of winning. It does seem to be ambiguous and broad. Even though I think circumventing what you absolutely know the voters approved because a lawsuit says you don't have to is a crappy thing to do to the voters, it may very well happen that way. The mayor knows what the voters wanted when that was passed. But he could get the green light, not because the voters didn't actually know what they were voting on, but because a judge might rule that the ordinance affected multiple subjects.
Either way, I think in this case, the known will of the voters will be subverted and the unknown will of the voters will never be tested. It just smacks as disenfranchising the voters and not just a shortcut to get to the inevitable.