Good thing Dash is not a Proof of Stake coin and never will be one, which makes any comparison to Proof of Stake coins wearthless.

Dash is and will always be a Proof of Work coin .. sure at some point after Dash Evolution the Proof of Work will be upgraded to Proof of Work 2.0
but there will always be an incentive for both miners and masternodes to operate in Dash.

I even think in a few years Dash will have the strongest PoW network on the planet, by-passing both Bitcoin and Ethereum's number of active full nodes
and making scalability much less a problem for Dash in the future.

The growth of active masternodes (full nodes) will also excellerate exponentially once Dash Evolution is out, with its decentralized masternode shares program.
Never underestimate the power of having blockchain identifyable saving accounts available, in a time of decreasing global banking interest rates (with my bank its currently at 0.9%).

Also never underestimate the economics at play in Dash and its Masternode Network : a lower number of active masternodes will increase the masternode rewards, which will attract new
masternode buyers.
  
For those interested in some masternode reward statistics : https://dash-news.de/dashtv/#value=1000



For those interested in the masternode summary by country : http://178.254.23.111/~pub/Dash/masternode_locations_stats.html