A number of reason...many of which people have already detailed.
1) Money: The City of SF essentially wanted something for nothing. They wanted others to foot the entire bill. They even went so far as to BLAME the 49ers for their failed Olympic bid because the 49ers decided not to build them a free stadium. SC didn't kick that much in either, but they were a much easier entity to deal with than SF. In addition, they COURTED the 49ers instead of sitting back and expecting the team to come to them the way SF did. Someone cited what happened to the Giants. Well the city was REWARDED for it's behavior because the Giants got that stadium built anyway entirely with prigate money. I think they expected the 49ers to eventually cave, but numbers just didn't add up.
2) Parking: Building on the original Candlestick site would create the necessity for the worlds largest parking garage. It would also have put fans in a construction zone for the better part of a decade.
3) Naval Shipyard: The pictures above were "Plan B"...to move the stadium over to the Hunters Point Naval Shipyard. It would have been beautiful, but there are MAJOR issues with that site. First, it's surrounded on 3 sides by water. Second, it currently has ZERO freeway access and would require a bridge be built over a small body of water. Who was going to pay for all that? The price of the infrastructure alone might have been more than the cost of the stadium. Third, as an old Naval Shipyard it was what is referred to as a Superfund site.
Not a garbage dump....a TOXIC WASTE SITE. The government was cleaning it up, but yeah...not a good place to put a stadium.
4) Traffic: The site in SC is built for large events. Great America, Convention Center....that was the point of the site. Large 6 lane roads and 3 freeways. Light and Heavy rail. Just makes more sense.
I blame ALOT of it on the failure of peple in SF to see the big picture. I remember when the first stadium vote came up. All I saw on TV from people was "why should we spend money on a stadium when we have bigger needs for the city". Short sighted. The stadium brings money IN to the city. A new stadium would have brought SUPER BOWLS to SF and that would be even more money coming into the city (at the time 400 mil was the estimate).
People don't understand the difference between an expenditure and an investment. As it is, the City is going to lose alot of money that flowed into it from Candlestick. Alot of that money funded the park service, etc. Now it's gone. Who do they have to blame? Themselves.
[ Edited by Marvin49 on Apr 22, 2013 at 8:53 AM ]