Honestly, most games don't take long to have a price drop. 6-12 months and they're down by 30-50% -- especially on big days like Black Friday. Here's the thing. If you're working to snag a PS4... enjoy the PS4. It's a better library and 95% of modern releases are also on PS4. Unless you're wanting very specific games exclusive to PS5, which there aren't many, just wait for PS6 and see if it'll be PS5/4 backwards compatible. Maybe by then, the PS5 will have a library worth owning a system for.
Not gonna lie to you, I want as well a PS3, have been reading a lot these past months and it seems that isnt that hard to release the true power of this console, for what have seen they aren that expensive anymore, might get one here if I manage to get one used in a Pawn Shop, thats how I got a Wii, a DSi, a PS Vita as well a 3DS, its kinda hard to get as many consoles/games when you are married and you are the only one that works at home, I said hard but not impossible