I watch football since a very young age. My first tournament was 1988. I have to admit that international tournaments nowadays are better simply because footballers are much better prepared, equipped, the game is much more intense and football staff are in possession with degrees and tools to maximize their knowledge of sports science.
The expansion of the tournaments was a matter of time. The main reason international competitions had fewer teams was not for competitive reasons, but it was mainly for the relationship between logistics - revenue, since it was much harder to organize things back then, and even for teams to move around the world.
Nowadays TV revenues are huge and it allows for a good expansion, which is good both for revenues and for social reasons. People who complain about the expansion don't understand that it brought more positives than negatives, and it generates a bigger interest for football on countries who were usually mere spectators, and with time I think the popularity of the sport might had suffered a bit.