Aside from the pending DoJ IG and the onoing John Durham reports, this article identifies other reasons why Supposed-Speaker Pelosi will not bring a vote to the floor of the HoRs.
https://www.washingtontimes.com/news/2019/oct/7/joe-biden-hunter-biden-could-be-forced-testify-don/
https://www.washingtontimes.com/news/2019/oct/7/joe-biden-hunter-biden-could-be-forced-testify-don/