how long do you think it will be before you are recommending pepole delete their old profiles permanently?

Unless you have a following which you are using the platform to reach (hopefully with the message of abandoning ship) I would delete it ASAP. Personally, the only things I post are steemit articles, and they've been having a great effect (close to 2 dozen friends migrated this month, and more waiting for "approval" from Steemit). Honestly, I wouldn't even use it for that if there weren't so many friends that I have no way to reach without FB. I have like 600 friends on FB(every single one is someone I know personally, in the real world), while my email/phone list is only like 350 (and many of those don't have FB)