These hearings wouldn't even be happening if the Democrats didn't take the house.
Correct. Yet, even in the current timeline, none of this would be happening unless the whistleblower had blown the whistle. Without that, even with Dems in control of the House, Zelenskiy would've made the announcement Trump demanded which would have meant that Biden's corruption and the FACT that it was Ukraine - not Russia - who hacked the 2016 election would be screeched on an endless loop, propelling Trump to his second term.
Also, Manafort, Stone, Cohen (maybe), Gates et al all get pardoned because it wasn't Russia so they can't be guilty. I mean, Trump may still get re-elected and/or all those crooks may get pardoned - but now we have a chance to go the other way. Without the whistleblower, we'd be living that Amazon Prime alternative history for the rest of our miserable, Russian-speaking lives.