IF they run with those lines, they have the potential to be better. However, the chances of them running with those lines are slim. There's no guarantee all of those players will even be with the team in October. Also as much as I'd like to see it, there's about a zero percent chance Blashill runs that defensive shutdown 4th line. It'll be Glendening and some combination of Svechnikov, Frk and Rasmussen (if he even makes the team)...
I love your optimism, and I'd usually be right there with you, and maybe (hopefully) I will be in the next couple months, when Holland maybe (hopefully) makes a few shrewd moves to get this team back on the right track...