The "Bitcoin is saving the grid" narrative is way more marketing than reality. Yes, miners can curtail load quickly. But the reason they need to curtail is because they're drawing massive amounts of power in the first place. They're not adding resilience out of charity, they're getting paid to turn off because they're a major source of discretionary demand.
If you remove miners, the grid doesn't suddenly become fragile. ERCOT existed long before Bitcoin mining and managed peak events without a single ASIC in sight. What's changed is that Bitcoin miners inserted a huge, optional load and now get compensated for not using it during stress. That's not "making the grid more resilient," that's being paid as a flexible burden.
The higher baseload argument is also selective. A grid doesn't need Bitcoin miners to justify infrastructure expansion - it needs predictable demand. Miner demand is only "predictable" as long as BTC price stays high enough to justify their operations. If BTC tanks, miners unplug instantly, which means the "baseload expansion" justification evaporates just as fast.