No one gets poorer when 1 SBD will equal 1 USD. With a headsup in advance, people will convert SBD to Steem. In all likelihood the value of 1 Steem will rise as a consequence, which makes the users of the Steem platform wealthier.
The speculators that hold SBD's on exchanges will become poorer, but I don't care about them to be honest. I care more about the Steem eco-system and its users.