No, I think it is inevitable. The Republican base is older white voters. These are people who
A. Have never had a reason to feel disenfranchised from the system, as many minorities do
B. Have had the time to have voting become a once a year habit, instead of only when all the attention comes down during Presidential elections.
Now that more and more minorities are voting during Presidential years, the inevitable progression is for more and more of them to vote during midterms and even off years. Once you've voted in three or more Presidential elections, it becomes easier and more likely you will vote during a midterm. That applies to the younger voters as well.