Nice attempt but here is what i think could become problematic with your idea.

1. a ranking in finding a block the higher you are to the 1st rank add very much to centralization because the top 50 could than maybe easyly 51% attack the rest. There is a reason we have 101 delegates who more or less mine the same amount of block  so there is alway a consensus, because in contrast of PoW Dpos has not much incentive for the nodes other than satisfy their voters.

2. the client is optimized to 101 nodes , increasing the amount of nodes would require rebalancing the code processing and much more under the hood it simply is not PoW work which can scale naturely with more nodes. Its is a very different approach with is strenghts and weaknesses.


I believe we will see lisk creating a very nice groundwork for developers to create a new internet of Apps on lisk and later on maybe in 3-4 we will see a major core tech upgrade that will revolutionize they way Bapps work in a similar manner dash and monero did for anon tx.