You could find a better defender than Haseley or you can find a better hitter than Haseley, probably not both. Haseley as your 3rd OF getting 125 starts is great for the development of Adam Haseley but not necessarily for winning anything of consequence in 2020. Unless you upgrade another position significantly (i.e. 3B) or really, really improve the pitching (which, no guarantees in the bullpen obviously).
But otherwise, Haseley as part of a four-five OF patchwork may work.
My guess is we have no idea what's gonna be on the table (obviously). We'll have a bit more clarity as the non-tenders and pre-Rule V moves happen. But if the owner is feeling as disappointed by this season as fans seem to be, and if he is not going to fire anyone, I'd expect a move we don't expect (much as we didn't expect Segura or Realmuto). McCutchen, Hoskins, Haseley and any prospect could be on the table, though between Cutch's injury and Hoskins' second half I'm not sure the market would be what they want. It's easy enough (and fair) to say any position but RF and C can be improved; but not as easy to actually pay the cost of acquiring a new 1B or SS or LF (even Dickerson is not necessarily better than Cutch).
The other wild card is, can they get anything at all out of some combination of Herrera, Williams, Franco and perhaps one of the three "incumbent" starting pitchers? A decent reliever, a decent bench player, a lower-level prospect restock that sets up other deals?
And then of course Herrera himself is a wild card, if he's untradeable and they don't want to or can't negotiate a buyout. Then he has to come to spring training, get sent down on merit, and can possibly be released. But what if he plays well?
I gotta think Jay Bruce is gone too, you can get something for him given how little the new team will have to pay and the 26 man roster may even increase his value (even though that also makes it easier for the Phillies to keep him).
Now I'm just having fun but if you could do a huge deal for Hoskins would you make Bruce your 1B? What about Franco?