“I could see direct entry CA on the 737, but without seniority list integration they'll have a hard time moving pilots from the 767 and 747 over to the 737.”

Very true. We don’t know yet what fences will be put into place and how long.
So initially, new hires for the 737 and maybe 777 fo’s who are looking for a quicker upgrade.
Time will tell how all this will work out.
Stay tuned....