The identity of the “Whistleblower” is known by the Dems and will be outed in a week or so by the Dems. They will blame this on Trump. The Democrats need the “Whistleblower” to make the rounds on the left wing media shows.
Add another stanza to the articles of impeachment.
The GOP isn't serious about fighting this. The longer it drags on, the better for them (DEMs hoisting themselves) and, they hope, the worse for Trump.