You see, one of the problems with having governments responsible for these projections is that they only know how to think one way. They can only create models based on the way they have always done things. And because there is always at least a little bit of self-preservation in any bureaucracy, these types of projections can be dangerous.
The city of Newport Beach should not only back off using eminent domain here, it should scrap the project altogether, because I believe that in 2020 there will be less traffic.
Long before 2030, businesses all over the United States will have finally figured out that existing technology can enable employees to work from home and save the company absurd amounts of money in costs such as insurance, mileage allowances, rent and supplies, just to name a few. They will have figured out that not only are telecommuters more productive than those in an office (40%, according to one study), they are also happier and more loyal to the company.