Reward reduces when hash-rate increase, is this easier for the 51% attack?

[bhkien]

About Dash mining reward, as far as I know that the reward would reduce when hash-rate increase.

Example If the total hash rate is 100 GHash, and the attacker add 20 GHash more to make the reward for each block reduce, it could make some miner leave to mine other coins more profitable. In this case the attacker can add more his hash rate to push more miners out, until he can get more than 50% of the total hash rate.

Is this the weakness of Dash?

 

[TanteStefana]

There is a limit to how low the reward can go. At first the limit was 5 coins. But it is reduced 7.1% each year. This year, it's 4.2 coins, and in (most likely) February it will be 3.9 coins.

Eventually, though, it won't matter as the miners won't have control over what goes into the block in Evolution. In that case, Masternode quorums will lock all transactions, and if a miner tries to include anything else, the block will be rejected.