"Dodger Stadium and the land is 100% privately owned, opened 1962, interestingly the last privately financed stadium until the Giants AT&T Park 2000. The only tenant (owner), the Dodgers, have no NFL team or municipality to deal with, no concern over financing, a very different situation from Oakland."
That's certainly true, but doesn't preclude the possibility of renovating the Coliseum. There probably is a good chance the Raiders will once again leave town. If this happens, renovating the Coliseum is a viable option. Anaheim converted Angel Stadium back to a "baseball only" venue and did a nice job.
Even if the Raiders remain, renovating is much cheaper than a new ballyard built from the ground up.
What makes the most economic sense is for the Raiders to share the new Niner's facility in Santa Clara and the A's to share AT&T. But, that wouldn't cost the taxpayers a dime so it probably won't happen <sarcasm>