Source: marvel.com

2. More Teenage Heroes

So, with Phase Three coming to a close, we're going to see a phasing out (PUN!) of many MCU regulars. And we’ll need new heroes to replace them.

But it's important to make sure that those new characters can last a while. I mean, it'd be good to not have to keep shuffling people off every five years. So how do you fix that? Start casting young characters and let them grow. The MCU’s Spider-Man will hopefully go from teenager to fully grown adult. Let's get more characters to do that.

Kamala Khan needs to be brought to life onscreen as Ms. Marvel. Maybe bring in Nova (Rich or Sam) or, once Tom Holland gets old, Miles Morales. Throw in some young blood to flesh out the MCU's younger cast.

Because if we want to see a Phase Six or Eight or Twelve or whatever, we need to start sowing the seeds for it now.