Falcon Cap IMO is a very interesting character and can fill in for Steve Rogers for a while. It also looks like the MCU is setting up Kang as the major big bad before Doom, which makes sense given that Phase 3 ended with the introduction of time travel and the multiverse.
It kinda sucks that MCU Spider-Man is the way he is, because with Steve and Tony gone, and with the X-Men and the FF MIA, you can do Norman Osborn as an MU threat and have Spider-Man take him down, which Dark Reign didn't do.
Ideally if Spider-Man had to be introduced in the MCU and couldn't wait till the X-Men and the FF are introduced, it would have been cool if he kicked off Phase 4 or was at least one of the first films. How cool would it be if NWH was out first introduction to MCU Spider-Man? (it obviously wouldn't be a multiverse film).