Don't know specifically about the bump program, don't know why it would not still be in existance.

But with CO/NW I don't really think you would need it. If you are on a CRJ than you are either on DL or NW as CO does not operate any CRJ's.

NW and I think CO both offer same day standby.

In order to give you options more information would be necessary. Such as who the ticket was bought through. Who is operating the flights, what code is on the ticket and items like that.

NW can usually take over a CO ticket (and visa versa) without too much trouble as long as you have not already checked in.