Drearyweather (quoting The Watchtower):
During the last days, Jehovah has continued to select those who will make up the 144,000. If he chooses to wait until late into that period to select some for that privilege, who are we to question his wisdom?šš¤£šš
It does indeed attempt to justify the continued increase (which resulted in a subsequent 18.7% increase in partakers in that year). However, I do not believe it was their intent to suggest that the number should be increasing beyond trying to justify the increase observed. For example, the same article does once again suggest that the increase in partakers could be because "Others may have mental or emotional problems that lead them to believe that they will rule with Christ in heaven".