They need to massively up the rewards on TB regardless. They were supposed to be run 4x a month. Now we're down to 1x a month each side. They've quartered our ROLO/Probe Droid shard acquisition from the originally scheduled rate.
To be honest, TB has been the least well received event I've seen and they need a massive rework. The waves are all the same boring bullet sponge enemies. It's already painful getting people to participate... running them 4 times as often will make people quit.