I wouldn't doubt it. I went to DL this summer and basically my girlfriend and I were the only ones using MBs, everyone just used smart phones or watches. I will say MBs seemed to work smoother as many people had to pull out their phone to scan into the park/fastpass line (they weren't prepared).
I will say MB+ is way overpriced to me, they go for $60-75, that's crazy for something that only has use in Disney. At that price I see them fading away, unless Disney can come up with reasons for people to want them. They had to keep the 50th statues for that reason.