By what UT stated, it will get replaced eventually:
"We view the Universal render pipeline as the successor to the default rendering pipeline in Unity (aka the ‘built-in pipeline’).
[…]
As we mentioned earlier, Universal render pipeline is designed to be the default rendering path for Unity, a replacement for the built-in render pipeline
"
(highlighted by me, from here: https://forum.unity.com/threads/wha…nity-with-scriptable-render-pipelines.924218/ , also including many mentions that suggest Unity wants the user to want to switch from BiRP to URP)
For reference: