With the possibility inching closer after the ruling, what impact will/would Don McGahn's testimony have on the Impeachment Hearings?  ?

Basically nothing at this point, but the judge's ruling sets a precedent for all the others Trump is trying to silence.

None.................

How should we know? Don’t get me wrong, I’m dying to find out.

If obstruction of justice gets added to the articles of impeachment (and it may or may not), McGahn may have something to say about that, including going back to when Trump allegedly ordered him to fire Mueller.

No impact. He will take the fifth as allowed and the democrat Judge admitted was the eventuality. Schiff cannot allow this to go to the Senate. He will be convicted and hung.

None....at all. It will be just like everything else.

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There is no way anyone can answer that. He could be compelled to testify, and then site Executive Privilege and not say anything. Or he could spill the beans and send everyone to prison.

Yet another " witness " testifying that there's nothing there .