I really doubt they'll ever be a Jewish candidate on a Republican ticket, unless the party shifts so dramatically as to make it unrecognizable.
If another Jewish Republican who isn't a useless House leadership party hack ever rises to prominence, it's a strong possibility for the tokenism. The problem with such a strategy is that not only is the Jewish vote is too small to be a factor in an election with some small inroads, Jews are heavily concentrated in non-swing states (probably at least half of the American population lives in California or New York). It's a complete non-starter as a strategy.