No, the SALT deduction does not benefit only the wealthy. It makes sense to raise it.

Sure, lots of really well-off — okay, rich — people would make out really well if the SALT cap were removed. But there’s a middle path. If we lifted the cap to, say, $25,000, that would help lots of middle-class people a lot but wouldn’t provide all that much benefit, relatively speaking, to “The Rich.”

Source: WP