Apart from NWWC, you probably won't see another GF tournament until late summer, so where does everyone else who can't get into the main team play?
We'd be extremely silly to pretend that a new NWWC will at all be at the same 'high level' as previous NWWCs, in fact it'll probably be quite unhealthy to do it in that format considering numerous 'top' players are currently taking 'breaks', the whole reason there's any form of discussion for NWWC is because everyone has the same worry that the top level just wont be entertaining enough, making the tournament completely dull to both watch and play. You'll end up with weaker teams than last year and fewer quality castings; I'd argue it would probably be 'healthier' since EGS just finished to have a more casual NWWC (with an obvious different name) which includes everyone, otherwise it'll probably just be extremely uninteresting.
Player retention in the form of an NWWC just simply wouldn't be good enough, it's very obvious that turning up to matches at 'top-level' has become a chore at this point rather than it actually being enjoyable. It's only really enjoyable for the people who're actually active and improving, which unfortunately are being left out on this one. Wouldn't surprise me if 'top' players would actually prefer a more casual tournament, they'd probably actually participate in a team their mates made rather than being pulled by the ear to turn up to a top level match.