Let's start in Santa Clara where Matier & Ross remind us that there's been three attempts to move a team that way-- the Giants, the A's, and MLS's San Jose Earthquakes (hey, did you realize they just won the MLS for Houston? Well, they did)-- have all, at various times, tried the move only to fail miserably. That's what we call a trend in the marketing biz.
The main problem with the 49ers move is that Santa Clara isn't going to hand over the land that easily in that they don't want to make things easier by giving out all sorts of handouts for the team. They also really don't have the land that the Niners want to build housing developments. See, the team wants to develop housing and shopping and all that stuff to partly pay for the costs of building the stadium, but there's no place for them to do it. The area by Great America where the stadium would go has no room and Yahoo! just swiped the only really open space. That's what happens when you pull a move to Santa Clara basically out of your ass. Says their press flak: