I could handle a season pass or expansion(s) that really bring new features to the game besides many new cosmetic things we can use for building and new rides (like a hotel expansion, a parades & shows & fireworks expansion, soaked expansion, etc). Micro transactions and small dlc's are really bad. Luckily it is a trend to burn those games with small dlc's and microtransactions to the ground on Steam, review websites and youtube channels.
Only exceptions are when a game has small DLC's included for free like for example in The Witcher 3, but even in this category some games cheat like GTA5. Sure all the GTA5 dlc is free and a lot of it you can use, but there is also a lot that you need to buy with a lot of in-game credits that you of course can buy for real money.
I am pretty sure Planet Coaster is going to work like ED and will get season passes. ED is a bit confusing, because it started totally different with the many options on Kickstarter and such. They already mentioned this in some ways and said that they hope that Planet Coaster can stay in development after release. I can easily see them releasing 2 bigger expansions (included in that season pass) in a year and every 6 weeks or so new themed building sets and some new rides.