Just like it is impossible for any country to make Bitcoin as legal tender?  And is the lightning network not evolving year after year?

If a company that uses the USD start accepting Bitcoin only... and pay its employees and its providers in Bitcoin, it effectively replaced the dollar as far as it is concerned.  It becomes about how much and how fast that happens.

So it will probably remain impossible until it happens.  If it never happens, it's very likely because Bitcoin will have failed, and it is likely that the US dollar will disappear well before that.  The value of the dollar almost completely disappeared already anyway.  It may not happen in 2022 though.

The universe will die, and so will Bitcoin and the USD, but it will not happen in that order.  I think that Bitcoin is set to survive the USD.

And the governments will never let that happen.  It will just happen is spite of them.