At our Methodist church we have a very good and large and special organ supposedly one of only a handful in the country built this way or something so it is used about 90% of the time. Our lead organist is very good she has her docorate in music and teaches organ classes and seminars all over the country. However when the childrens and teen choirs sing their accompanist uses the Piano and when we have a sub they will occasionally use the piano. Saturday services are in the Chapel so she uses the piano then. I like the organ, it feels more worshipful to me and fills the sanctuary with sound. Our church is large and pretty well spread out over the ages. The reason the PPR committee may be trying to make the older members happy is they tend to have generous checkbooks! If the Pastor feels strongly about it he should go back to the group and express his views-he is a member of this committee and usually has great influence. If not since they are paying you to do a job do what they want or quit it really is their choice not yours.
It's a 3-tiered organ with foot pedals and an expansive pipe section and he really can play that thing!