But you want this accessibility to be restricted
Being able to generate interest with only purchsaing 10 drk is a much lower barrier to entry than building a mining farm ..

Interesting, attracting new people to buy altcoins isn't gonna be easy.
How would you see this interest generated to make up for the loss of mining? Or do you see it as an alternative when most rigs stop mining DRK?
Concerning the argument about not being able to mine a crypto resulting in people losing interest... what do you think a noob can wrap his head around more easily.. piecing together a mining farm or purchasing a simple 10 drk and entering his key into a forum/website.
Concerning attracting new people to crypto, the instant and anonymous transactions aspects are useful enough in themselves.
Concerning rigs not mining drk, if the masternode network generates blocks, there is no use for mining.
If Evan created a redundancy of block generation by MNs, it wouldnt have to be activated immediately. We could see that it worked, while increasing MN payment ratio by 5% a month as he proposed. As mining became less profitable, the onus of supporting the network would gently shift toward the the MNs.