I love Fyreflye's comment that her doctor's dream goal is 39 weeks :-) Between 34 and 36 weeks babies are considered
late preterm babies - usually fine, but sometimes with sugar, temperature, or more likely, feeding issues. Breastfeeding can be hard for these little guys because they're not strong enough to bring in a good milk supply in mama - so stay vigilant with feeding times and weight gain! As a NICU nurse, I've seen a lot of these little guys come out fighters with absolutely no issues at all - and I've seen some who have serious respiratory trouble from the start and need a 2- to 3- week NICU stay to learn how to breathe and eat.
All that said, there are a lot of good points brought up in your posts. If you're ruptured, than infection risk really is a major concern. And the interventions we use to
stop preterm labor aren't very effective, but they do have side effects. If we're talking about the best time to take out a nice, stable cerclage, than the later the better - but if we're looking at a mom who's standing on her head, ruptured, on 3 different drips, than 34 weeks is a great goal.