I suppose you should count on them finding empoyment elsewhere. If I we you, I'd begin interviewing new people for all five posistions immediately. Don't make it a secret. tell the current employees that you are planning for future expansion and unexpected contingencies.
You may discover that some of these people will now be plotting against you, undermining your business or trying to go into business for themselves using your customers as their new business base. If so, fire them immediately - no two week notice BS - and get them off your premises ASAP.
Good luck!