How would you describe the position you envision?

In an ideal world, every parish with a large music program would have an organ scholar position. Too many pianists and organists, myself being exhibit A, plunge into church work without having adequate experience in service music accompaniment and choral conducting. (And there's also the oft-forgotten need to cultivate skills in interpersonal relations.) I’ve always envied young church musicians who benefit from the example and guidance of an in-house mentor.

I applaud your efforts Mark and think a young organist or organist wannabe would be lucky to have you as their supervisor.

The bilingual thing is also going to limit your choices. You might consider adding there that you'd accept an Anglophone that was willing to learn Spanish. Perhaps purchase a Music Department copy of Rosetta Stone or some other language learning program and have that be a part of the study. I'm in the process of beginning to learn Spanish myself and it's not easy, but is a worthwhile skill for every Catholic musician in America.

but is a worthwhile skill for every Catholic musician in America.

I get why you say this, given where you work, and the changing demographics in the USA, but I still think that this is overstated.

I don't think that even in 10 years, MOST musicians or priests in Pittsburgh or the UP of Michigan, or Fargo, ND will need to know Spanish.

The other side of the coin is that people who speak Spanish are becoming more fluent in English with each generation.

We actually have a sizable minority in our parish of Hispanic descent - and no demand for liturgy, music or anything else in Spanish. Most of them are very comfortable speaking English and although they might know Spanish, they view it as the language that they speak with their grandparents. And they might be quite proud of that heritage and committed to teaching their children the language as well - but I don't see any desire from them to use it in their daily life, including at mass.

PGA, I don't think your crystal ball of demographics is clear enough, there's still a huge kaleidoscope of liturgical issues that musicians will have to prepare for regarding the Spanish speaking communities (and they are diverse, Cubans not being Columbians, Mexican-Americans not being Salvadoreans, etc.)
One needs to remember that the future parish will likely seat 2500, or there will be clustered parish merges (like mine) with four or more parishes. In over two decades here, I've not witnessed a decrease of demand for Spanish language Masses. Quite the opposite. Whether or not this demand is stoked from the grass roots or from the heirarchy is irrelevant, the reality is that Spanish demography indicates an upsurge in all regions, especially in urban areas. We here in California have dealt with multiculturalism for a long time, and there is no generational evidence, even among recent generations of American born, Spanish speaking families, that Spanish is abandoned in the home (though English is also spoken there), the schools or the marketplace. And certainly not in Roman Catholic parishes and denomination churches.
The other issue that will affect "the Spanish Mass" is the same one we face in the English Mass- the reinculturation of the Roman Catholic liturgical culture, ie. chant in the vernacular or Latin, or consolidation to more traditional, solemn forms of musical expression. One can see that easily by going to seminaries and cathedrals in Mexico. But the examples provided us by dear Benedictgal in South Texas are realities everywhere. Conjunto, Ranchero, Mariachi, Tex-Mex.... all these stile popular forms are standard operating procedure by the volunteer laity who comprise the music ministry for Spanish Missas. A RotR oriented pastor will have his work cut out big time should he fervently desire to alter this scenario that's become embedded.
It can be done. But it will require organists/directors who not only have the Spanish language skills (I do not, but am working to establish an appointed liason with amazing skills and is a teacher), but also an understanding that what might seem customary communications and processes to Anglos, do not necessarily work the same way with our Spanish speaking brothers and sisters.

I'll add - we ARE experiencing the request for Quinceañera celebrations, and all sorts of other cultural things. It's just that they seem perfectly comfortable with the liturgy in English.

Don't worry, what i said about piano was a joke. I think as many languages as possible is important. In fact, consider as much as organ playing. Organ playing can always get better.