The shared masternode technology was engineered and tested already. There can be also many providers of such service, so no centralisation of coins need to happen.
In addition, we are prepared to offer hosted masternodes, that is, you have the Diamonds, we have the hardware/software/network/setup and you just "invest" your 10k DMD in running (renting) one. The network benefits from having more masternodes and you, the investor benefit from higher payout on your 10k DMD investment. Again, there might be many providers of such services.
Or you can arrange it all yourselves. It's everyone's choice how to invest/benefit -- or just play with all this stuff.