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I don't know what about you guys here, but I think that the Nations League is already unnecessary and the results in those matches show that neither players nor national associations give too much about that competition. If the FIFA then were to add more matches or expand competitions, it would not bring any advantage besides more money for the investors.
I agree, although I believe the intention behind the introduction of the Nations League was to minimise the number of international friendlies, so it was not meant to be a tournament of a similar prestige as the Euro or the World Cup. But maybe it was just an excuse. I'm not sure if a national team could opt out of the Nations League with no repercusions from UEFA.
And I'm not sure if FIFA can be blamed for the Nations League, or was it entirely UEFA's doing. I believe UEFA has a lot of independence from FIFA.
Anyhow, the tendency to increase number of football competitions (be it national or club) and increase number of games within each tournament is already causing fatigue among many of the football fans.
UEFA is completely independent in organizing competitions in Europe such as European club and national team competitions, including European championships in different age groups and the Nations League.
Friendly matches are actually financially unprofitable for UEFA or European nations and through the Nations League, a third-tier competition compared to the World and European Championships, national teams can prepare their teams and players as before, and still compete for a trophy and prize money at the same time.
Smaller nations often get an additional opportunity to qualify for the European or World Championships through the Nations League, for example.
On that side, I think that the Nations League still has more advantages than disadvantages.
Of course, with the increase in the number of club and national team matches, there is also increased physical effort for players, more injuries, fatigue, but apparently lately, earnings are more important than anything else.
FIFA even wants to sell the rights to the World Cup to private investors and increase the number of participants in the World Cup to 64, so unfortunately we can expect an even greater number of matches and competitions, but fewer quality and interesting matches.