Hoskins is already changing the perception, nothing like a "star" (see Embiid) to get fans excited.
To me this last year was more like the 1972 Phillies, which was a horrible team, carried by Carlton.
In 1973 they won 71 games as the rebuild took hold, but attendance stayed flat, it started rising in 1974 when they won 80 games.
That team already had Boone, Montanez, Cash, Bowa, Schmidt, Luzinski, Carlton, Longborg and Ruthven - it was obvious they were on the rise.
Attendance was flat from 1996 through 2002, even though they won 86 games in 2001.
The years of losing wore people down, but also that team had Lieberthal (30), Rollins, Rolen, Burrell and Abreu. Wolf, Padilla and Mesa were teh pitching staff.
I suspect fans saw more of a patch job than a rebuild.
Fans got excited in 2003 when they won 86 games again, when they added Thome, Polanco and Byrd.The pitching was still bad but the team could hit.
Attendance would rise each of the next four years, despite treading water, 86, 86, 88, 86, adding Howard and Utley in 2005.
I think what drives attendance is not so much winning, but the expectation of winning, that is, when they see enough talent on the team that they can dream.