Exactly. Miners follow demand. History has proven it. For example, if Bitcoin Cash had more demand than Bitcoin, it'd probably have more hash rate than it too. It's approximately 173 times less than it.
It's more accurate to say that miners follow "profit" not demand. For example bcash never had any demand, specially in early days but it could attract a good amount of hashrate simply because they manipulated the difficulty adjustment algorithm so that miners could mine 1000+ blocks per day (for comparison you can mine about 144 BTC blocks/day). So even with the low price and low demand that bcash had, the miners could make more profit in total so they made the switch in that period.