A transition that takes 16 years might actually never happen. Several contributors and developers who will begin the work might not be with Zcash if it’s going to take that long to migrate from PoW to PoS.
The hybrid model makes sense for the 6-12 months transitionary period where large ASIC miners would anyway start leaving, opening up room for many individual/hobbyist ASIC/GPU miners to fill the gap created by them, all whilst running staking nodes which will help start the transition process.
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