The Empire Builder has, over the past decade, been the most reliable of Amtrak's long-distance trains. It has really only been in the past month that the route has suffered chronic OTP problems. Why there would suddenly be a call to scrap the route after one month's worth of problems is beyond me.
Extra frequencies would be nice, but aren't going to happen without someone footing the bill.
Truncating the route in MSP and having a different train operate MSP-CHI creates a new host of costs. The size of the yard at MSP doesn't matter. You don't have commissary in MSP. You don't have a large mechanical staff (I actually don't know if you have any mechanical staff). There's no maintenance facility, and no easy way to get equipment to/from a maintenance base (Seattle isn't set up to perform major maintenance either, and Portland even less so).
Assuming folks would want to make a 7:00 am connection (or 11:00 pm connection), there's still the issue of train 8 being late, and having the new connecting train hold for it (eliminating any advantage of splitting them), or spending a ton of money on reaccommodation costs.
The number of flights between MSP and Chicago is an interesting bit of trivia, but not really meaningful if you want to have a serious discussion of what to do with the Empire Builder. The fact is that, outside of the NEC, there are tons of city pairs where you have many flights but poor to non-existent rail service. LA-Las Vegas, Atlanta-Orlando, Denver-Dallas, intra-Texas service, etc.
I think we all pretty well understand that rail should play a larger role in some of these travel corridors. Amtrak understands that as well. The problem is that there has no serious transportation policy in this country, and rail has been neglected for decades. A bunch of money was just allocated to rail, but that will come nowhere close to making up for the decades of disinvestment in intercity passenger rail.
Amtrak, even with available equipment (which doesn't exist), can't just decide tomorrow that there will be another train or two between Chicago and Minneapolis, and suddenly start running it. If you look elsewhere, you'll see that UP is demanding three quarters of a
billion dollars just to increase Sunset Limited service from 6 to 14 trips per week.
There is no shortage of "plans" on how to improve rail service in this country. What there is a shortage of is actual money and political will to do so.
In any event additional frequencies of a CHI-MSP run would not fall under Walker's purview as it was an existing service when Amtrak was formed in 71. Of course Amtrak will want to seek funding from Wisconsin, but may have alternative means.
Any service less than 750 miles will have to be state-supported, as that is a mandate of the PRIIA law passed a couple of years ago. Whether or not the route existed in 1971 doesn't matter.
Existing non-subsidized short-distance corridors (except for the NEC spine), including the Empire Service and Wolverines, will need to receive state subsidies by 2013 or will face elimination.