I would love to see a more modern downtown with lots of tall and interesting buildings - all lit up and colorful - make Dallas feel like the smaller cousin.
I would also like to see some mountains to the west of Fort Worth - like in Denver -- LOL, just kidding about this part.
I think that the highway system could be planned a little better. The way you merge from one highway to the other and then have to immediately get over to get to a third highway (or continuation of the highway you want is very difficult, frustrating and most importantly dangerous, especially with increased traffic. The roads could also have better up-keep and better signage all around. Also it would be great if there could be some laws, road improvements, whatever to lessen the number of tractor trailer and large truck roll overs.
More nice restaurants and more shows and movie theaters too!