Try to remember that any one person on here will most likely have lots of friends, family and contacts still on Twitter, and they may even quite like Twitter!
Mastodon *is not* and should not be a Twitter replacement. I reckon it will do best if it's a good site in its own right with its own great community of goodness. If we only exist with the agenda of bringing Twitter down and stealing all its users we'll be a bitter community of badness.
Connection in all its forms is Good.