As far as I know, hardware requirements have gotten pretty lenient if you’re satisfied with “medium” settings. Hence, a gaming PC won’t be that expensive. However, if you want the extra ultra details 4k flavour 60fps, then it becomes expensive
As for console exclusives: They still exist and since the PC isn’t a curated platform like PS or XBox there aren’t any real exclusives. If you consider Indie games (on Steam for instance) as exclusives, then it shifts dramatically.
Your 4x2.4GHz might be on the lower end though, and I can’t guarantee that just adding decent GPU would do the trick. Personally, I’d consider something like an i5 2500(k) right now as the minimum for something more resource intensive, like Witcher 3 for instance.
Console vs. PC.: I don’t like playing on consoles, nor do I get why people prefer it to playing on a PC since imho the reasons for a PC far outnumber the reasons for a console. If anything, I’d probably build a steam machine, if it had to be some kind of console