You have three teams in 2019 that are head and shoulders above everyone else so far. One of those (at least) isn’t going to make the World Series. And there could be four or five teams win 100 games, which has never happened.
The Dodgers and Yankees are on pace to win 106.6 (yes, I know, but there’s a reason I included the decimal). Astros are on pace to win 105.6. Yet it would surprise very few people if the team with the eventual best record plays in the Juice Box, especially after they added Greinke. The Twins are on pace to win 99.6, rounded up to 100. Only seven times (including 2017 and 2018) have there been three 100-win teams in MLB. Now we are likely going to have three, easily could have four, and five is not impossible; Cleveland would get there if they finish 32-16, and they might not even win the division if they do.
And only in 1909 and 1942 did a team win as many as 104 games and not have the best record in MLB (neither one made the World Series because they were second in their league, which tells you something about the rest of the NL those years; those teams were the Cubs and the Dodgers).
One more oddity. Only twice in MLB history has a team won 100 games three years in a row: The A’s in 1929-30-31, and the Braves in 97-98-99. Houston is on pace to join them. You would think the Yankees would have done it at some point, but no. Three out of four, yes (36, 37 and 39; 77, 78 and 80). The Cubs did it four out of five years in the Tinker to Evers to Chance era, but not three in a row.
Why so many 100-win teams lately? I can only guess it’s because a few teams took a page out of Houston’s playbook and creatively tanked, and there have been some quality teams who took advantage.