Agree overall.It is worth noting that, even with a larger number of French colonists in New France, the empire could still have fallen. Québec ultimately fell in 1759 not because it lacked for defenders but because the French navy was cut off from supplying Canada. We could well have a situation where there were more Canadiens and Acadiens but New France was still cut off from French support.
I do think that there was a possibility of more expansion. Granted that the rapids just upstream of Montréal acted as a good barrier to easy traffic, I do wonder if the shores of Lake Ontario might have been colonizable with a minimum of disruption. The Huron and other peoples once living in the area had been displaced permanently by the wars of the mid-17th century. Could the seigneurial system have been extended to Ontario? I wonder.
They tried : incitative settlement? failed (see above). Military settlement. Failed. Turning Louisiana into a French Australia? Failed. Trying to get replacement settlers? Not as much attempted as which ones?France should have followed the path of Spain in sending any Catholics, regardless of ethnicity or national origin to the colonies. It should have offered additional incentives to draw settlers. Spain sent Acadians, Germans, Frenchmen, Canary Islanders and Filipinos to Louisiana.
There was no French Canada (and even less French Louisiana) during Wars of Religion : it's a bit the whole point of the thing, giving the Wars of Religion kinda freeezed any serious colonial project, and the only ones planned at this point utterly failed due to the lack of resources.During the Religious Wars, send drafts of refugees to the Mississippi and St. Lawrence Valleys.
It wouldn't be a prudent politic for the king [...] to depopulate his own kingdom as it should be required to populate Canada. [...] this land will populate itself slowly, and after some reasonable time, could become quite considerable, giving that depending of Her Majesty business within or outside the kingdom, She will give it help according Her possibilities.
It was exagerated. While definitely electing to focus on European and metropolitain matters would have been a valid choice, as @Oamlyya said it would have been really hard to desertify France out of her population with providing with more settlers and ressources.And was that wrong?