So whilst I think this is a really great proof of concept and a good and innovative idea to bring to Steemit, I do think that the bot is currently not serving a useful way to switch over to IPFS hosting other than to make users aware that it's possible, and unfortunately these messages are starting to become spammy:
https://steemit.com/steem/@tuck-fheman/can-the-streemian-bot-stop-spamming-plez
I've commented in there a way in which we can turn this in to something a little more useful for the community and a little more opt-in.
I really think this idea has legs, and IPFS as a defacto image hosting solution sounds like a really great idea - I'm certainly interested in helping!
On a side note, is the code for the bot open sourced anywhere?