Yes, you should still download.
Yes, you should still download.
You're considering getting GTA V physically but worried about the file size and internet cost. Since DVDs can't hold 65GB, you might not need to download it if you buy a physical copy. However, check Amazon's current offers and shipping options for the best deal.
It seems you're questioning the game status, but there might be a new update planned for day one.
They include more than one DVD. There is also the possibility of day one patches that might need downloading. Though no one will be able to tell you for certain until it is released.
Are the Blu-ray discs included? Since you only have a DVD player, it might not be compatible.