I was going to make this a poll, but I figured it would be better to just say what you believe was the worst thing to happen. I know a lot of you have your opinions on it, so I'll just make this one open.
I'll start it off by saying that I believe demolishing the old Med. Arts Building for Burnett Plaza was an absolutely awful idea. I HATE Burnett Plaza. I'm sure many of you know that... but it's NOT what I think is the worst decision.
Honestly, I think getting rid of the old Tandy (Leonard's) Subway was the biggest mistake. I'm sure many of you wont agree with that, but I feel that it could have been something more. We could have been the only city in Texas with a full, functioning subway system. Sure it was only a mile and went from one stop in downtown to a parking lot a mile northwest, but it was still a subway.
Maybe I'm being to overly optimistic, but I could envision a subway line running up and down Throckmorton, Houston, 1st, & 9th Street. Of course, it would only stay underground in downtown. I'd be crazy to suggest a full underground subway anywhere outside of it. The rest of it would be typical light rail.
Just my take. It's not gonna happen now, but a guy can dream.