Necessary or not - it doesn't hurt to plan the robust model, just in case. The 
proposal is:

Let every 210,000 the code calculate the average difficulty of 100 last 
retargets (100 fit well in 210,000 / 2016 = 104.166)
and compare with the maximum of all such values calculated before, every 
210,000 blocks:


if average_diff_of_last_100_retargets > maximum_of_all_previous_average_diffs
        do halving
else
        do nothing


This way:

1. system cannot be played
2. only in case of destructive halving: system waits for the recovery of 
network security


Best Regards
Jaroslaw
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