A friend told me some answers I dont know where but I know who said them.
1)Siddur Yavetz on bentching says what I consider the best answer that when Mosiach comes the land of Israel will expand VIDUK
2)I think the Haemek Davar says our minds will become more expansive (I guess the eretz is the mind?! then I have to see that one
- Ramban on the Posuk has two answers but i don't remember them i will edit later if someone else can find it or any other answers and edit the answer or post the answer themselves before I can Find it would be highly appreciated