Maybe I am a minority, but 3D Touch is one of my favorite features on the iPhone. I use it for absolutely everything, and it's a huge convenience and shortcut. I think this will play nicely with the control center.
I find its one more thing to confuse novice users. It's a huge pain for me when helping friends and family as now they get these "weird menus" or it does "strange things" when the accidentally press too long on a screen. Thankfully i can turn it off...
While iOS has become great for more advanced users, the easy of use is getting worse and worse as they make them more complicated to handle the new capabilities.