Once you give a right and you turn it into the status quo, it's very difficult to take it away.
If Republicans take over congress, in all likelihood, they won't try to rescind it. If they do, you will get a ton of human interest stories about immigrants being screwed by cruelty. When parole expires, there would also be tremendous pressure to give a permanent solution.
This isn't obviously ideal and it's still questionable whether it will get passed. But I ll take it any day of the week and twice on Sunday because this is our best shot until the 2030s.