Personally, I think that the severing of ties has a lot to do with more than just the oil field. Hartwig covers most of the midwest, and unfortunately for Hardinge that includes John Deere and Caterpillar territory as well. Between oil/gas, ag and heavy construction equipment being down markets, that leaves not a lot. My personal mantra is to focus on what I do best especially in hard times. Hardinge does "direct" best, and Hartwig does Okuma best. I think the sever is more a symptom of the overall economic outlook in the Midwest.
I do not think there will be a "bad guy" or a "good guy".
I do fear for Hardinge. Elmira is a long way away (from the midwest) and historically getting great support from them required you be within a certain radius of their facility. Plus, when I last worked with them, their staff was aging. Very smart, but lacking in young talent.
I also fear for their overall lack of commitment to a direction. (Fanuc, Seimens, OSP, Mitsubishi and I thought you could get a Heidenhain at one point as well)
This is a small sand box we play in. I'm sure whether the split was amicable or not will most likely never be divulged. Neither side wants to "talk smack" about the other. One day they may need them.