1 totally within the normal range - not being dry at night isn't considered to be a 'problem' till they're 7. (And at that age it's still not uncommon)
2 I'm not sure why you'd feel odd about either option. If it's that you don't like getting rid of a good bed, you can donate it to some charities eg Emmaus. Maybe you should ask your DS if he'd prefer a big bed or more floorspace to play on - it's going to be his room after all.