Sorry about your wormery collapse mr van.

I would suspect that the remains of the bag would contain quite a few cocoons. Maybe you could get it really wet, add fresh food and a major hatch will occur. I was able to regenerate my herd after a similar collapse a few years ago by dumping the VC into a new system, wetting it and then buried it with horse manure.. A few months later worms were everywhere.

I currently have 7 separate worm systems.

It sounds like your hardiest worms are in the barrel. I would not worry about the species as long as the compost.

Good luck, Pete

Over the weekend I was in bad need of more soil type stuff to mix into four planter boxes so I used the whole contents of my worm inn. These are 18" deep 15" wide 32" long (one is 64" long) wooden boxes over concrete patio which I built up like lasagna gardens (over wintered straw bale, weed leafs, kitchen scraps, shredded leafs, worm bin). There's a lot for worms to eat all covered with a few inches of potting mix. I also added a few handfuls of the composting worms from my outdoor bin. I figure any worms in there late this season will be predominantly compost worms and will work to perpetuate bins.

I may even try doing some pocket feedings later this season.

I thought about trying to start the bin over like Pete talks about but 3 reasons stopped me (mainly the first two):
1) I needed all the fill I could get my hands on
2) More work and not enough time
3) ph or some other chemical imbalance may have happened and caused the die off