If we go back to pre-COVID times, I cannot see United granting additional access to any lounges, United Club or Polaris. It would especially impact Polaris. LAX was already too small, EWR gets crowded before the European flights and even the massive SFO lounge could be incredibly busy. The service would just get worse.

And why would United do this? A certain number of GS would take up say Polaris access and give up Plus Points. Nearly all the seats are still going to be given to people who were lower on the upgrade list and lounge usage increases. Net increase in expenses plus more pressure on the lounges.