I've been mining Execoin with five R9 270X cards (about 1050KH/s) almost since it hit Coinwarz.  I've accumulated a decent amount of coins and would stand to gain considerably if the coins suddenly became "more rare", but I strongly feel reducing the mining reward will backfire.  So much in fact, that I signed up here just so I could post this reply.

More than anything else, a crypto coin needs hashrate to survive.  Sure, I'm thrilled to see 300+ Execoins being mined by my rig each day at the current difficulty, but the low difficulty is also a bad sign that this coin is losing its appeal to miners.  Reducing the reward will only further deter miners from choosing to point their rigs at Execoin.

What is really needed to reduce the overall number of coins being dumped at exchanges is more miners who are willing to hold their coins.  I have no idea how you'd make that happen, but that's the medicine Execoin needs.