With all respect, 5 years is a long time and we should ideally reach that goal in 1-2 years.
If Steem Inc. wanted to do it we could have that in months. Even without busting out the ninja-mined stake, if they wanted to give @themesopotamians one of those million-SP delegations I could make 3000 dolphins a year.
Without their support it's going to take longer. I'm conservative on the five year estimate because it's just taking into account the projects that are active and communicative right now. Hopefully we will also be growing.
Maybe @kpine has a different estimate, it seems like he might be doing similar things to what I am with much more power and much less talking about it. I haven't included him because I don't really know.