Are you anticipating that someone here will know the answer to your question, or that anything you get here will make this decision more definitive? If so, you will be sorely disappointed.

Some will say that there will be depreciation, and propose a timeline. Some will say that things won't change much (and cite examples from other airlines). Some will say that there already has been depreciation having nothing to do with bankruptcy and that this will continue. Finally, some will say that it has become harder and harder to use the miles and that this reflects an effective depreciation that will only get worse.

I think that about covers it

Cheers.