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We already have studies that show at what rate nodes would get wiped out at current block size and in increases of 2MB up to 8MB. This study was developed by Bitfury:

So if BCash was getting used AND spammed as BTC does, blocks would get filled and 95% of current nodes would get wiped out of the system.
What does it mean "wiped out of the system?"
Is that computed as a side effect of the fact that people don't have, say for example, another 200 gb to dedicate to block chain for each year that passes?