Losing Hoskins as things currently stand probably costs them 1.5 wins at most. He was a 2.9 WAR player last year and they'll find a way to squeeze 1.4 WAR out of the various replacements. Hall put up 0.4 last year, though moving him to 1B might keep him right around there (i.e. he'll add offensive WAR but lose defensive WAR. But Bohm's time at 1B will probably add to the overall team WAR just from the better defense at 3B).
If need be they'll have a whole different 1B by July 31. The trade deadline is really what makes it so hard to handicap win totals from the start.
We (the list, and fans in general) still far more optimistic than the computers and bookies, pre and post injuries.