1000 DASH for collateral is extremely high. The current 6% reward is barely enough of an incentive IMO.
It isn't 6% reward it's 45% and 50%-60% after Spork 21.
You must be thinking of ROI but you've even got that wrong because you've denominated it in Dash which is incorrect. ROI is denominated in the currency invested, so if you invest dollars in a masternode you measure your ROI as the value of your investment at the end of the year minus the value at the start all divided by the value at the start (and all measured n dollars).
That means you have to take into account the capital gain or loss of the collateral. The 6% would only apply if we were a stable coin.
If the masternode (~60%) reward, coming straight out of the blockchain, causes the whole chain to devalue then masternodes will have a NEGATIVE ROI. Your 6% will get wiped out in an instant. So it's important to optimise the reward ration for capital gain, not to maximise masternode reward in Dash. That's just the way to make everybody poor.
The rewards are only paid out in DASH and it has nothing to with whether DASH is a stablecoin or not. So the roughly 6% a year in DASH is what you get based on your 1000 DASH collateral. You are not answering my questions or concerns but instead arguing about something that I never suggested. If masternode rewards were reduced to 20% of the block reward while maintaining the same collateral requirement like you proposed, you don't think it would be an issue to only have 1600 masternodes? That's not too centralized?
Doesn't it seem that even with the incentives as high as you think they are (60%), that it's not enough to increase the masternode count?
To me the right direction would be to make changes to double the masternode count, thus encouraging new growth and further decentralization.
You can't base the viability of the coin on masternode growth. It needs to work for the equilibrium condition, where the network is stable otherwise when it hits that condition the price will just crash (like it did the last time. Now we're struggling to even reach escape velocity because all the rewards are being pocketed instead of going towards upwards difficulty adjustments).
So, we've already achieved the ideal equilibrium condition (masternode count saturation) way before mass adoption? If the whole world is to use DASH, 5000 masternodes is enough? That's decentralized? I think DASH should still be looking at growing its network if it wants to be around 10 years from now... only once everyone has DASH on the phone should we think about some kind of equilibrium.