The result to be expected, contrary to well-meaning officials’ intentions, is misuse and waste of land (not to mention the hardships of involuntarily uprooted families). When private developers buy up land through voluntary transactions, they face a market test. If a shopping center or office complex flops, the developer loses his own money and will have trouble getting bank loans the next time. Wishful thinking is thereby constrained. The market ruthlessly weeds out incompetence. When town officials grab land through eminent domain, to assemble a parcel to sell to a developer (more cheaply than he could have managed without eminent domain, otherwise he wouldn’t have waited) whose shopping center flops, where is the personal penalty for the town officials? At most, if voters are informed enough to hold them accountable, they face a slightly higher chance of being voted out (if still in office), or a slightly reduced budget to play with (unless tax revenues can be enhanced somewhere else). Wishful thinking has almost free rein.
So my prediction: expect to see a few more half-empty shopping centers ten years from now.