rather optimistic, don't you think? That's basically the position that all classical white openings hope to achieve, and all classical black openings hope to prevent.
e4/Nc3/Nf3/d4
Any threats concerning . . . what? Typically 1.e4 gets a response of 1...c5 or 1...e5, both of which prevent d4 (or at least, keeping d4). But 2.Nc3 and 3.Nf3 is usually good (if likely to be boring). You can look into the Halloween gambit if you want to spice things up.

The most reasonable opening this happens in is the probably the Pirc defense. Black freely lets white take the center.
1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nc3
Good Opening or not?