Are the San Franciso 49ers and Oakland Raiders going to end up sharing a new stadium in the Future?

Both of Northern California's, Bay Area's NFL teams have old Stadiums, I'm hearing talk that the 49ers might move to Santa Clara, and if the Raiders don't get a new Stadium in Oakland, they could move to Santa Clara and both the 49ers and Raiders will share their potential future Stadium, so what do you think will happen for them?