Serious q: why hasn't this been done? Observing from afar, it really looks like the administration is asleep at the wheel on this one

Easy for me to say it but a bit more complicated in real life, and there are people better versed than me who could probably explain precisely how any move in that direction would be hung up in courts for years and likely undone by SCOTUS. Still like to see it mind you.

because the lesson the Democrats took from Watergate was that ignoring Republican shenanigans worked out. Republicans otoh learned that they could keep testing boundaries