Legacy content clarification

So from what I’m getting at, the biggest and most direct impact this will have to consumers is that legacy content will soon no longer be printed? This means we need to purchase older campaigns as soon as we can otherwise we won’t be able to anymore?

Since this isn’t a competitive game and there’s no tournaments, there’s nothing stopping us from continuing to use older cards. It would essentially just be a “house rule” to only use cards within the current (past 3 years) card cycle?

I know this helps a lot from the production and game design side but I’m just trying to understand from a player and consumer side how this would impact us. I haven’t even been able to play a single campaign yet and I want to start with Dunwich and Carcosa.