Now here is my other question, what company in their right mind will want to buy this now vacated interest in these terminals?
There are literally thousands of options. DPW creates wholly US-owned subsidiary - or one with controlling interest if not wholly US-owned. Individual operation could be sold off to business consortiums already in the business. Neighbors at various ports may have an interest, etc.
Whatever form the "new deal" takes need not resemble the proposed P&O -> DPW transfer.
I think there are really a number of scenarios that could make this a very sweet deal for some company and I'm pretty sure that someone has been envisioning it in much more detail than I could come up with.