No open source project can ever die while there are people willing and able to either work on it themselves, or pay somebody to work on it for them.
If you have a large investment in Pascal code, abandoning it will cost you time, effort and lost opportunities. You might like to consider putting a dollar value to that cost and paying a developer to fix GPC on Mac OS.
(Not me: I don't have a Mac and don't know enough about the GPC internals to have any hope of doing the work myself.)
Otherwise, there's always hope that some fan of Pascal on the Mac will get it working again, some day. But hope alone may not be sufficient.
Good luck!