Some of us waiting nigh on a year still don't have a delivery date, yet later orders of the exact same spec already delivered to other customers - I don't believe it was necessary for many to have waited as long as they have, even with industry wide issues.
The shambles at MG is primarily down to their weak decision making, lack of customer care, poor communication, inability to get a grip on their dealer network and a vehicle allocations team that studied at clown school. For those reasons alone they should at the least honour any ZS order tied to a 3rd party discount (PiCG, Motability, Affinity ect.), even if they are forced to cancel/offer alternatives for the rest. What will actually happen next though is all speculation until MG issue anything in writing.
Having the next gen ZS ready as an alternative might've helped if that's easier &/or cheaper to produce, but that looks to be a way off. The 4 isn't an option for some, not only in terms of practicality but due to the quality of certain elements.