I hope you are right. However, this bill does show us who supports amnesty as a general principle, since they could have killed the bill here and then tried to introduce their amendments as stand alone legislation.
Following consideration of all of the amendments offered another cloture vote will be taken to end debate. If that cloture vote passes, it will lead to final passage of the bill which only requires 51 votes to pass.
Anyway you're right - the bill coulda been killed today. But there are some senators who, if the right combination of amendments pass, will vote yes on cloture and yes on the bill.
But that is problematic as I mentioned each amendment's pass/fail will affect nearly equal numbers of senators. So it's really not such a big vote today IMO.... just the leadership trying to make it look like a big victory.