Very interesting thread, and even more so is the very heartfelt opinions. Here's my thought. I'm in favor of the new changes. A daily run from CHI to LAX via SAS is great. I don't think it'll pull passengers off the SWC. Of course, and I don't think anyone will disagree, full service into downtown Phoenix is a very big must, and if it can be done, it will only help.
There is currently no "four points" service in the Amtrak system. It's more like a big triangle between Seattle, New York and LA with through services in Chicago, New Orleans, Washington DC, and Emeryville (from a geographic standpoint, not a service standpoint). A "trip around the system" misses thousands of miles in the SE. As the traffic flow patterns in this country are typically SW to/from NE, there is very limited, if any, SE to NW routes. The reason for that is simply economics - the demand isn't as high. Not "there is no demand", but it is not as high.
Currently Miamians MUST travel to WAS to get to LA, and even then it's still a three seat ride. It can't even be booked through NOL as there is an overnight layover. The first choice that comes up actually takes the rider to NYC then CHI to get to LAX!!
I think that if an overnighter can be had between SAS and MIA could be done in 21 hours, it would be awesome. Everyone else north of DC can make it to LA in two seats, so that would make it a real ride from MIA to LAX if it could be done along the old Sunset route. 1 seat from LAX to MIA is NOT necessary, and will only exasberate timekeeping - which, in my opinion, is what REALLY killed the SSL. After all, no one in NY or WAS can get to LA in 1 seat, either.
Both MIA and SAS are suitable for turnaround service and crew bases. This will solve 95% of the current routing problems and will not have to extent the CONO to JAX (they could eventually, that'd just be a bonus for all), and for that matter any of the solutions from NOL to the South.