Steemit is a frontend to the STEEM blockchain just like Steempeak or Esteem. Steemit is actually much shittier then the other two but more popular.
If youre here to make money im afraid that by killing SMTs due to purchase by Tron and making Steem into some blogging platform Steemit is you might lose quite a bit of money, if youre invested at all.
I dont think they will be killing SMT's, why would Justin spend money to take it over and kill it? What financial benefit is he getting?