Like KIA did with autos, when Menards gets their freight car production to be very reliable, and then moves into the more scale like, "high end" product, I'll bet the larger train manufacturers will have to take greater notice.
As to KIA, I had always thought that a newer manufacturer that gave a longer warranty would have a newly found competitive edge. KIA did extend their warranty, and, with other improvements, KIA's fortunes turned around.
Personally, some of the reports about the Menard's freight cars have made me skittish about purchasing them. Unlike many who sincerely enjoy a challenge and a repair project, having to repair a newly purchased freight car is not on my list of things that I wish for or, plan to do. The Menard's store is not that close to my house, and returning the defective cars is a 3+ hour, unnecessary project. If Menards were to pay return shipping for defective product -- UPS, the U.S.Post Office, and, FedEx are all close to home -- and, come up with some means of making the return process less time consuming, inconvenient, and, expensive, I think that would go a long way toward increasing their customer satisfaction level.
But that's just my opinion, and others are obviously willing to "ride the rapids", and complete the necessary repairs as a trade-off for a good price, and an attractive, useful, inexpensive product.