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Who gets to decide how slow is too slow?
Mining these days requires investing in ASIC hardware. Solo mining or running a pool will very soon require investing in a reasonably fast network connection and a machine with at least a few gigabytes of memory.
Knocking the slowest N% of solo miners/pools off the network every year (where N is less than 20 or so) is not a crisis. That is the way free-market competition works.