I saw where FEMA is spending like $60,000 for RV trailers for people to live in temporarily in New Orleans.

Other people do not want to return. Why would they? You are a family of 4 living in a government paid apartment and they expect you to move that may people back into an RV in front of a house you don’t have money to repair (if it can be repaired)? That would be dumb for anybody.
This solves nothing.
However a modular builder (like they use for apartments, pre-fab housing, motels, prisons, etc.) could construct a building facility in New Orleans (providing jobs & taxes for residents, keeping the tax base) and instead of wasting all this money on rent subsidies or over-priced RV's they could design a basic "core" unit with all water, electric etc. for initial foundation construction. Then maybe 8-10 different basic room unit designs for different size families & different needs. These would connect to the utilities in the "core" foundation unit just like they do in other construction.
A family could (based on what they had before and their needs) select a combination of units that best suited them. These could be designed to be more hurricane resistant & energy efficient than the old frame houses.
With mass production even basically skilled labor could have good jobs building them; then they could be moved and finally assembled on the location of the old house. Maybe costing $40-$60K at most to give people a new home if they sold them at cost.
If they needed to; no-interest, long-term loans could be provided so it wasn't "welfare" (right wing argument) and people could do the final finishing (like painting) themselves so every house wouldn't look identical.
This could solve the housing problem for the poorest areas of the city while bringing jobs back to support other business & taxes in the city and giving "refugees" a great incentive to return & have pride of ownership in a new home to improve their neighborhoods even more.
Hopefully you get the idea. I have seen many shows on how economical it is to build this way (most motels, apartments and even prisons are built this way nowadays) and it could be done faster & with less waste and chance for corruption than any "conventional" rebuilding (if they wanted to be really great they could use "green" features in the units to make far more eco-friendly housing than those old frame homes)
Just an idea that is seems to me to be better than continuing to pay for expensive RV housing and/or subsides for rent with the government basically "paying" former residents encouraging them NOT to return to New Orleans.
If they can’t find some
real solution like this (I’m just a plain person, no economist or builder or anything, surely the "experts" could figure it out) maybe what some say is true; maybe it is a sly way to restructure New Orleans and get rid of what some prejudiced people consider the “undesirable” people.