Little bit risky, if they dump the easy gains, it will mess up again.
Actually, more pro-active working and discussion in this forum, is better.

(1) why miner do not interest on this coin

There are so many similar coins,
And,miner just consider the profitability first,
Even we agree or not, it is the reality.
Even LiteCoin also under the influence.

At 1.5, the hacker's selective mining will be blocked,
It means the current miner will get 20-30% more coins with in same time.
But,  it is not enough to catch the similar level with LTC.

How we can suggest this coin to the others ?
We may need a reason why have to mine this coin.
What reason we can give to them ?

Difficult,
So, difficult.

Anyway, it will takes a time to get one more chance,
At least, 1000M GRA should be mined