In fact, this mechanism is so good we are going to reduce its use on a sliding scale over its short three year life, the end of which this marvelous tool will no longer be available.

How in God's warming green earth could such a clause be proposed in a serious bill. Games were being played despite whatever Trump had to say about it.

Mike, it was a very serious bill. SMH. Here's something on that part from Forbes:

<snip>Admissions Program, for the purpose of determining whether the eligible individual is subject to any ground of inadmissibility.”
Border And Asylum Measures

The Senate bill contains extensive asylum and border measures, including hiring more asylum officers and raising the credible fear standard. The bill’s most controversial provision would allow the Secretary of Homeland Security to invoke “border emergency authority” to stop processing of many individuals when reaching certain thresholds of in admissible alien encounters. This authority is similar to the Title 42 expulsion authority exercised by both the Trump and Biden administrations. An analysis of data on Title 42 questioned its effectiveness in reducing illegal entry.

“When use of the emergency authority is authorized, the Secretary has the authority to prohibit the entry into the U.S. of all individuals, except unaccompanied minors, between ports of entry and may only screen individuals for eligibility for withholding of removal or protection under the Convention Against Torture,” according to a summary. A compromise recommended by the National Foundation for American Policy would sunset the provision after three years, allowing Congress to evaluate whether the measure has been effective and allowed human rights to be protected.

forbes.com - Senate bill adds immigrant visas and h 1b family protections

It was very serious. The sunset may have been so if Trump was elected he can only abuse it for so long. But first, take it at face value - they would evaluate to see if it's effective, still necessary, and if human rights were protected.