The guys over at Kotaku had a brilliant idea for FF7R. According to them, right now you can buy the PS4 FF7R for its sale price of $30 over on Amazon. Then you can upgrade later for free. You'll still have to purchase the new content separately so keep that in mind. I don't think I'll take that path and just wait because discs are soooooo last gen.
Speaking of which, luckily the Spider-Man Ultimate Edition disc comes with a download code for Spider-Man remastered, so you only have to use the disc for Miles Morales.