If the scientists disappear then why go back. It's like not doing a quest and they are gone forever.
Maybe the winning party of OWB (the scientists, or presumably Mobius) offer sidequests after completion, like collecting things, or exterminating the new pests that have entered the area as a result of their new experiment. They could do much more after completion. I just hope OWB isn't completely story quest-driven and has decent sidequests, not like "Talking to Waking Cloud, the to Daniel, then to Waking Cloud and bingo, you just gained 600 xp by initiating dialogue." Not enough, try "Talking to Follows Chalk about society, then to Josh, then to Chalky again, and BIG WINNER 600xp, and you didn't do anything special."