We're kind of at that part of the season where its still super early to draw definitive conclusions, but we are starting to learn more about a team's identity. There have been plenty of teams historically that start off well and still end up losing 90+ games, but at least so far it feels like what the Cubs are doing is fairly sustainable. No, the offense probably isn't going to finish 3rd in the league in runs per game like it is now, but it looks like it will be better than last year. Plus there are guys like Morel and Mervis in Iowa that can provide reinforcements at positions of need (1B and DH).
I had them in the 74-78 win range to start the season and maybe I'm just feeling good about the 7-3 stretch here but I'm bumping it up to 80-84 wins while allowing for the possibility that they might actually be playoff caliber.