It's an election play, not a serious attempt to show impropriety on Trump's part - which is just as well because, as you say, there's nothing there. The fact that Pelosi launched the impeachment inquiry before the transcript was leaked is a clear indication the conversation between Trump and Zelensky was never intended to be treated as a "final straw" but rather as fuel to be added to the fire. The problem that the Democrats have is that this contrived "scandal" risks throwing the party's most valuable asset - Joe Biden - under the bus by drawing direct attention to his supposed illicit activities in the Ukraine. For those of us who would rather see a moderate in the White House, it could be a problem.