Unless a lot changes; it is absolutely not achievable. Currently the Academy can not take a throughput of more than 150 new hires per year. Even using the training capacity of other companies to meet t7 requirements, it's not that those companies don't need their own training capacity in the coming years. Add to that; currently the HR department is as efficient as Greek government. There is no way they can cope with 48 interviews per month, and they can not get 48 GACA qualified people to each interview in any case. People who are that qualified have a lot of options.
Even if they did manage to get the required number of candidates into the training center the attrition rate is still high. People decide Jeddah is not for them. Lifestyle for A320 new hire Captains is not particularly good. GACA are not going to lower their standards.
Let's say 800-1000 Pilots in 5 years would be an absolutely remarkable achievement.