If a person has doubts that Jehovah will fulfill His promise to care for His servants, then Satan simply needs to keep up the pressure and such a person might stop attending meetings altogether.
إِذَا كَانَ ٱلشَّخْصُ يَشُكُّ أَنَّ يَهْوَه سَيُتَمِّمُ وَعْدَهُ بِٱلِٱعْتِنَاءِ بِخُدَّامِهِ ،‏ فَمَا عَلَى ٱلشَّيْطَانِ إِلَّا أَنْ يَزِيدَ ٱلضَّغْطَ عَلَيْهِ لِيَتَوَقَّفَ عَنْ حُضُورِ ٱلِٱجْتِمَاعَاتِ .‏