you should get a decent yeild(2-3oz) but you should do a little detective work to see why they are so stressed looking. ww should not be yellowing and going necrotic at only 5 weeks as it is a 9-11 week strain. what have you been feeding them. the yellowing doesn't bother me as much as the necrosis. some plants can be real N hogs and if they don't have a sufficient amount in them at the start of flower they tend to yellow out early, although a dose of cal-mag in flower can help prevent this. what is a bit more disturbing, is the dead parts of the leaves, this could be a different defficiency or more likely you have multiple lockouts do to improper ph. do you regularly check your ph and make sure you properly ph all water and ferts before giving it to the girls? if you listen to what you plants are telling you and try to correct any problems as soon as the occur then you will drasticly increase yeild, potency and overall quality. this is a pic of 4 ww's at 5 weeks flowering(day 39) under a 400hps in my scrog cabinet.