There've been other posts saying the egg rolls have been removed from the menu recently.
The restaurant IS still on the dining plan. Unless they just removed it from the dining plan today. If they did, that would be the first time any restaurant has EVER dropped from the dining plan in the middle of a year. Unless the previous poster meant that you just can't get shrimp lo mein on the dining plan (that would also be a departure from typical dining plan policy but Y&Y isn't a Disney restaurant, so who knows what they might do)
I've had the CS and the TS and I much prefer to go inside and eat at the bar.