Dead? Never. Dramatically decreasing in relevance? Absolutely. Pokemon is the last main stream bastion of hope for the battle system. If that goes, turn-based will be relegated to more niche franchises like SMT and Fire Emblem.
I still hold out hope that Pokemon will switch to a real time combat system like that of Ni No Kuni, and I wouldn't be even remotely surprised if that happened sooner or than later. Maybe Gen 9.