Unfortunately for the current administration, it would be cheaper to remove them from office that it would be to comply with their investigation. A future administration may be much friendlier towards tech.
Big tech will likely drag this out as long as they can.
I don't know about the USA but here in The Netherlands things being said during elections certainly aren't set in stone. To name two examples: empty promises get made, and rhetoric gets used. Now I know the latter is true in USA even far more but I am not sure on the former.
Empty promises get made all the time. This isn't one of them. Facebook wouldn't survive a Warren administration, e.g.,—assuming that Margrethe Vestager leaves it intact.
Big tech will likely drag this out as long as they can.