Excellent article here from the B.B.C on why Democrats WON'T...likely take a vote to impeach Trump. (recommended)
A few excerpts:
"Before the House takes the momentous step toward impeachment of an American President, all of its members should be on record with that consequential action. Most importantly, it gives clarity to a federal court in balancing congressional demands against executive privilege."
...more
The House speaker might be trying to protect the handful of holdout Democrats or view the move as a waste of time. She might also be afraid that a House vote would encourage Republicans to press for the kinds of investigatory powers that congressional minority parties had in past impeachment proceedings.
The last thing Democrats want is congressional Republicans
subpoenaing Joe or Hunter Biden in an attempt to shift the focus away from Donald Trump
....finally
In the history of our nation, the House of Representatives has never attempted to launch an impeachment inquiry against the president without a majority of the House taking political accountability for that decision by voting to authorize such a dramatic constitutional step."
Nancy has neither the historical, legal, or political basis of support right now to call for an impeachment vote. Until or unless she has all three firmly under a stool to stand on, there won't be any impeachment vote.
Full article
B.B.C. News Wednesday October 16, 2019
Why won't Democrats vote to authorize impeachment?
www.bbc.com/news/world-us-canada-50061727