If you are good at playing all of your games, then yes buy it now. For myself, I find that I am better off buying only one or two games at a time. I get distracted by the shiny new thing a lot of times, and so if I bought all those games at once, I know there’s no way I’d get to all of them, because of new games coming out that I’m excited for. Also all of those games will give you a lot of play time. But again, depends on the person. All of those games are awesome and definitely worth playing in my opinion.

Idk, just to give you a differing opinion, maybe only get one of those fallouts for now to make sure you’re into the series? If you don’t mind some jank, New Vegas is widely considered the best in the series. If you do mind, fallout 4 has more of a modern feel to its combat and I would consider it to be more accessible to most people.