There has been a lot of discussion about this lately, with FIFA apparently gathering strength to propose to hold the World Cup every two years. As is probably to be expected I am against this: nothing is more special in terms of football than the World Cup (if not in quality, where the Champions League is much better), and already the expansion of the number of teams is diminishing its importance, and holding it every two years will further diminish it to nobody's benefit (I understand if FIFA sees it as a potential for short-term profit, but I cannot see how it can be any benefit whatsoever in the longer term).
And I think today's Nations League semifinal between Italy and Spain is another example that FIFA should be careful to not give us so many matches, that in the end nothing is special. The match was great, with the European Champions of Italy losing an exciting match 1-2 to a rising Spanish side. Arguably two of the best teams in the world, playing a competitive match at the highest level, but the stadium in Milano was not even sold-out! This should be proof enough that if too many matches are there, interest from fans will diminish.
A great match, and probably a great final, but there is already so much football, that FIFA must be careful to take away what makes it special.
Christmas every month would not be special.