Boards held for the Officer Candidate Course are held by each individual coast. You have the Eastern Recruiting Region (ERR) and the Western Recruiting Region (WRR) which are separated by the Mississippi river. Depending on what side of that river you fall is your respective recruiting region for the Marine Corps.
Each Region receives its mission from Marine Corps Recruiting Command (MCRC) and then gives it to the Recruiting Regions, which then give it to individual recruiting Districts in their Recruiting Region. There are 6 total Districts for the Marine Corps. 3 Districts per region. The mission is given out every fiscal year which starts in October of every year.
As it stands today, MCRC has no need for additional OCC pilots, with some exceptions. The exceptions are usually very highly qualified applicants. Therefore, if your OSO is asking you to submit, it's probably because 1) Your highly qualified 2) To make you look good for future boards (i.e. showing persistence). However, if your OSO is submitting you, there's a reason behind it, and it most likely won't hurt you.
Will the mission/requirement for more OCC Pilots change. Only time will tell.
I hope this helps.