I think Pelosi is dragging her feet on impeachment because she knows that all the bad stuff that went on under Obama will be dragged out into the light at the hearings. I assume that she's working on the assumption that a Democrat next year. That may be a big assumption, its what everybody said about Hilary.
Simon: Impeaching Obama is a waste of time, he's already not President, which is the only possible punishment for impeachment. He can still be criminally charged if a crime becomes known (see above).