Yes it is Wolf's fault. Not all of it, but he is largely responsible for this mess. He put all the company's eggs in one basket with the UA merger. All he and Rakesh did was dress up the company, buy back stock in an attempt to inflate the price so he could get a patsy, such as Goodwin, to overpay for the company. He promised to make US the carrier of choice but didn't really live up to that promise. When the UA/US merger began to hit turbulent waters, it became clear that Wolf and Gangwal had done little to position the carrier as a strong independent. They just about ignored the continued incursion of low-cost competition in their core markets. They cut and ran from their large BWI operation. Finally, they launched a low-cost operation (Metrojet), yet made horrible decisions deploying it, such as in markets where there was no low-cost competition, thereby eating into their own yields.
You cannot blame the employees of US entirely for the company's failures. Do they share some blame? Absolutely. The union kept demanding higher wages and ignoring the cost problem and the onslaught of low-cost competition. The problem was eventually going to come home to roost. You're now seeing the result of that neglect. But Wolf never intended to position and run US for the long-term as an independent. His sole intention was to dress the company up and sell it off and take off. Once it became clear that wouldn't happen, the wheels fell off the bus. Just as Gangwal said to legislators, they had no Plan B.