That's a no-brainer. Immediately after the Judicary hearing, half a dozen "not nutcase" DEMs went on record that Trump is a felon, and impeachment hearings must happen. The sequence "Mueller hearing then impeachment" has been the plan, with a bogus conditional that impeachment would be on or off depending on Mueller's testimony. Bogus because impeachment is on regardless of substantive contents of Mueller hearing - DEMs were fine that testimony was cabined to contents of report.
Function of today's hearings is to provide video and sound bites to Mockingbird Media.