you can call this an ORBS attack or an attempt of ad-hoc coalition forming for 
a fork.

Preparation Step:
Include a transaction sending a sizable amount between two of your own 
addresses in every block.
Miner can do this at zero cost in their own blocks.

Embed into the preferred fork a transaction double spending the regular 
do-nothing transaction with one that offers a sufficiently high fee. This 
offers inceptive to rational miner to join the ad-hoc coalition for that fork.

Attempting to form an ad-hoc coalition using above steps is open to anyone, 
just cheaper and easier to execute for a miner. 

Fortunately cost for (cumulative) proof-of-work creates a lower bound to the 
incentive that need to be offered. So your worry
of times where block subsidy is low is unwarranted as cost of POW will be high.

I do not think “disallowing” the implementation of rational mining is a viable 
option, since no one needs permission to implement whatever optimization he 
thinks is profitable and within the rules.

Tamas Blummer

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