That is a very long line, though -- 34 hours. 6 hours behind schedule is a lot in absolute terms, but it's only about 17%. I've often had 6 hour trips turn into 7 hour trips, in all modes of transportation.
What it comes down to is that 34 hour trips are not something we are ready to put up with anymore, unless we somehow make the trip itself part of the goal, whether it's an "Amtrak Residency" or a long range road trip with the sights and the hotels.
Having 3-5 shorts lines service the 34h/1400mi overall length makes more sense really. Maybe 5 7h lines during the day, and 3 11h overnighters. 7 to 8 hours is about as long as I'm willing to spend in a daytime train, and my previous experiences with 10 to 12 hour sleeper wagon trips have been pretty great, too. Any trips longer than that you can either spend a night in Sacramento or you have to take a plane or you just don't go and vote that the rail network gets improved beyond a pathetic 40 mph average.