We could, accommodate them with ease, but we won’t just like we didn’t back in 1939. God has a purpose in wanting them in Israel ... read the book of Revelation and you will understand.
You know, those who did come would be escaping the craziness of Middle East politics. And, as a bonus, those who did come would also be escaping Israel's government-funded, universal and compulsory health care system.
It's like a twofer. ;-)