What you proposed might be helpful in terms of redistribute the ninja-mine steem.
But firstly, I think 5000k isn't really enough even though it can make a dolphin, then again, as Acid mentioned, @ned once did an experiment by delegation large amount of SP to individuals, which apparently didn't work out either.
Secondly, delegation to dapps was at the first place probably wrong, why should investors invest in SP, individual investors' votes worth too little compared to the 1 or 2 million SP dapps got.