Blackout could have been prevented with $200 chainsaw, if someone in the US mid west did their job and pruned brush under the power line
Seriously though ... grid is a very complex system and as such there are countless ways it could have been propped up. Yes, system was close to capacity at that time making it more fragile, so extra generation capacity would have helped, but there is also a question of systems and algorithms ... how system is controlled and what procedures are used in an emergency to contain failure zone, instead of letting it spread. Better control systems, allowing to selectively shed the load, would have stopped the total collapse.
I was relatively close to one of the power plants when grid went down .. ironically loss of grid stability resulted in "too much energy" in the power plant which produced a need to vent steam to atmosphere (it looked a bit concerning for a few minutes). The irony of lights going out and power plant having too much energy to handle is still not lost on me until today.
It then took 3 days to restart everything, again not for the lack of generation capacity but for the difficulty of balancing generation and load.
I think thats where megapacks and autobidder come in.