The fact that French stopped sending colonist to New France was a political move not a reason to think France not capable of having and colonizing a settler colony. If the French had continued sending 5,000 settlers as year to New France which if it had political will was completely doable the British would of been dealing a population of 1 million instead of 60,000. Plus stretching to what is now Ontario.
therefore if peace continued or was negotiated and France still held Louisiana it would not sell it and over the next several decades populate it with French and other catholic Europeans.
Louisiana in the New Orleans area was developing into a slave labor driven plantation economy. The area is prone to the same type of illnesses they have in other semi tropical climates. Staple food production was low, food had to be imported. The area you want to settle for a White Settler, staple crop economy is up in Arkansas, and Missouri, and west from there. The area West of the Mississippi is drier then East of the River. Then you start entering the Great Plains, with the deep sod that needs deep plow farming to break the soil. This is very labor intensive.
It took generations to cultivate that hard land of harsh continental weather, with bitter cold, intense heat, tornados, hail, and wind storms that flatten crops for miles. Most of the land is dry, so you have to dig deep wells for water. This was the land of the Buffalo herds in their millions, and swarms of locusts. It also has roving bands of nomadic Indians, who will trade with trappers, and traders, but will kill settlers. There are good reasons the Americans settled the Pacific Coast first, and filled the middle of the country in later. Living in that wilderness was a hard life. Most people aged fast, died young, and broke. To this day there are reasons the Great Plains are a low population density area of the United States. The Coasts are richer, and more densely populated.
It's a hard life for Frenchmen used to their moderate climate, and rich soil. I'm painting a picture of a land that was very hard to settle, and cultivate. Not many people would be Eager to go live in a vast harsh wilderness.