This Hive to HBD operation is nearly the exact opposite to HBD to Hive. There are differences:

1. Not always possible to convert this way ( when there are too many dollars this operation will fail )
2. Formula for the amount of HBD is different than the reverse of convert with teh constants HIVE_COLLATERALIZED_CONVERSION_DELAY, HIVE_CONVERSION_COLLATERAL_RATIO, HIVE_COLLATERALIZED_CONVERSION_FEE
3. The conversion is instantaneous

Source: https://gitlab.syncad.com/hive/hive/-/merge_requests/191

I guess I have some hope that HBD will keep around the value of a Canadian dollar.