I didn't realize I had a copy of the 12-17-17 game. I scanned the game briefly looking at shots of the crowd. You're right. It was a sea of green.
During the 1st quarter, Rams had the ball and it was 3rd down and 11. Goff couldn't hear, because Eagles fans were deafeningly loud. Ball was turned over on downs. Aikman said the Eagles fans travel very well and the Rams knew they would. I've attached a couple of screenshots. Joe Buck said that McVay joked to them that the Rams might have to use the silent count here at home because they expected so many Eagles fans to be there. Aikman commented that the Eagles played the Chargers in San Diego earlier in the year and pretty much took over that stadium.
So, yeah... it's probably going to be at LEAST that bad... or worse.