Steem dollars or dollars? I'd go with Steem dollars. After all, it's not a real dollar but a financial instrument on a blockchain. It's better to be clear on that and not decieve people to think that it's something like dollars in their bank account.
Steem Power or Locked Steem? Locking up something has a little negative feeling in it. So I'd rather use power up. It also describes better that Steem Power has "real power" – more you have it, more your votes count. You are more powerful!
Bitcoins? No thanks. It's slow, expensive and it's development is in crisis. Steem is not only a social media platform but also a payment network. If we become really successful, there is no need to encourage users to use bitcoins – we should get them to use SMD instead! It's way more better, it's price-stable, fast and free to use.
Just think how succesful Facebook bank would become if FB allowed every user to make transfers for free with anybody without any restrictions.
I wouldn't be surprised if people are going to start to use Steem only because of Steem dollars. Also merchants are going to like it more than bitcoin because they don't want to expose themselves to price fluctuations. I predict there will be apps that are just wallets without posting and voting features.
Social media platform combined with payment network might be a real killer app for a blockchain.
RE: Planning for long-term success of Steemit: Identifying areas of improvement