[Retric]

It's a market not just one collage.

Some distant collage may chose to pay for such a teacher and then gain students from the community collage who want that instruction. So, in that context your community collage bringing in the H-1B may end up costing an American a job. It could also depress wages for teaching that language discouraging other students from learning it thus extending the shortage over time. Alternatively, the demand may simply not be there for the language at which point the collage is better off paying for a different type of instruction that more students want.

In the end your H-1B is clearly a boon for that collage. However, if may end up hurting the country overall.