I still haven't heard anything about the potential location for the proposed multi-use facility. Politically speaking, it is no longer cool for governments to use eminent domain to take private property for public use because it ususally means taking away the areas where lots of poor people live as the "just compensation" is less than what the owners claim after talking to attorneys. I suspect that is why none of the housing to the east of the Dome was ever threatened by the use of eminent domain, although it might have been the logical solution to increasing parking for the Dome.
So far, any of the floated "downtown" locations I've heard mentioned aren't currently vacant and would stir up a lawsuit in a heartbeat if the City tried to take the properties, businesses, and housing away from the current owners. However, do you smell a rat when you hear that some property might be acquired up near the Pearl development. It's near to downtown, but that is nearly irrelevant since it has already been developed into a shopping and entertainment and residential complex. Imagine the extension of the river walk up to there and you have a pretty neat package to offer---assuming you have the site for a large sports complex with adequate parking. I know some additional space has been cleared in the area that is being used for parting right now. Cool.