If he invested 10M for the ninjamined STEEM stake + steemic.com website, he just needs to create +10M in value for the TRON network. It doesn't matter (for him) if STEEM value goes to 0.

This a fine point that many scoff at. Keep in mind, steemit.com is an established alexa-ranked site with pre-existing crypto cred. Block One paid 30 million for the voice.com domain alone. He could burn the STEEM blockchain, his STEEM stake, the entire STEEM community (a few thousand active users), and still come out of the situation with exactly what he wants.