It would, however, be unwise for Republicans to take any solace in these numbers for the long-term viability of the party and for presidential-year election races.
To begin with, low turnout by Hispanics (three-quarters of whom are born in the United States; the rest are naturalized citizens) is generally a function of age. (“In 2014, 33% of Hispanic eligible voters are ages 18 to 29. By comparison, among white eligible voters, 18% are in that age group.”) Not only will the Hispanic population in the foreseeable future be growing, but it will be aging, and therefore increasingly likely to turn out for midterm races.
Second, one reason Republicans are not competitive in some races (e.g. New Mexico and New Jersey this year) may be attributed to the party’s minimal appeal among Hispanic and other minority voters. In presidential election years, low appeal among minority voters effectively means that states with a big chunk of electoral votes are out of reach (e.g. California, New Jersey, Illinois). The problem, even for incumbent senators and House members in presidential years, occurs in states with big Hispanic populations, regardless of whether they are competitive at the presidential level (e.g. Florida, Colorado, Nevada).
Quite simply, if the GOP wants to be competitive in seats sufficient to win the presidency and control the Senate, it will need to broaden its appeal. Doing nothing on immigration reform is a recipe for long-term failure in an increasingly diverse country.