So yeah, maybe others will take time and read ... and potentially conclude that they should WITHDRAW the witness votes already casted in order to replace them with a PROMISE that they'll vote at a later time, perhaps, if the time is right and if the witnesses PROVE that they were instrumental in a new listing of steem

That would be stupid ;-) (but there's a chance that they will read our comments before doing that)
IMO, among exchanges that we are not listed yet, there are only few exceptions where we should be trying more than them ;-)

Anyway, people have their own ways of choosing their candidates to vote for. Some better than others. Not voting for at least few witnesses that do their job (providing security and reliability to the network) is a mistake.