The arrival mess is a solvable problem. It is not going to be perfect in the temporary building, but more immigration staff to check passports and more staffing to process the luggage is possible. It is not like they don't know how many people will be arriving. Although it is a temporary building, 8-12 months is not a "temporary" situation. That is quite a long time to have visitors subjected to this fiasco. For those that think the new arrival facility will be done sooner, they haven't met a deadline yet.
Having said all that, we just booked another trip for the end of January. All 4 of my children are coming, along with spouses and 6 grandchildren.
Scott