by impeachment I hope.

Not well the clock is ticking

I think Muller will take some step that basically drives the final nail in Trumps coffin but before impeachment Trump will resign claiming the deep state made him do it and then he will fade back into reality show/shady real estate world. Or if there is any justice he will be arrested for various corruption charges and spend a decade or so in rich white guy prison. Not much justice but something.

Lots of hopeful answers here. Allow me to present an equally likely scenario:

After 8 years, having spawned numerous lookalikes who saw his success and mimicked it. America the Great is America the universally despised, except to the far right. Increasing withdrawal into isolation in a world where everything is connected, and her global power vacuum fought over by China, Russia and increasingly, India.

i don't know how exactly - I just hope it's SOON !

Trump will go down kicking and screaming. Mueller will have to drag him out so we need to wait until he has the full goods on him. Russian money laundering? Hopefully it will it will include a jail sentence and it's so bad Pence won't be able to pardon him without himself being tared and feathered.

The article is only speculating..no new info.
I say the sooner Trump and the GOP leadership are indicted for collusion, the better.

By a sharpshooter?

As quick and quietly as possible. Pence might be worse.