do you think that the Empire Builder will continue having problems with landslides for the next 3 weeks. Wondering if I should cancel my reservation from WDL to CHI and instead go MKA to CHI via commuter train.
I think you should not cancel this trip. It only affects a small part of the route, and won't affect your portion.
There's no guarantee that the WDL-CHI won't be affected. In theory, a very short bustitution at the beginning of a two-day trip shouldn't affect things down the line...but consider that the EB due to depart SEA yesterday eventually pulled out of Everett 4+ hours late. Was that due to the bustitution or some other factor? I don't know. But it's currently running 6 hours late and hasn't even reached Montana.
OTOH, the EB is capable of running 6 hours late without the assistance of a landslide....and there are times when Amtrak can get an Everett-originated train out on time. All that said, I do agree with not cancelling the trip. Just be aware that you might be running late, or in some cases be switched to a bus that they sometimes secure for pax traveling between MSP and CHI when the train is running many hours late.