What you suggested could work. The thing with a lot of the popular PoS coins is that they combine a PoS approach with dedicated multipool support, therefore limiting the sources where coins can come from while increasing the buy pressure and thus raising the price.
There are two obstacles: 1) slow adoption and 2) efficiency/efficacy of pool.
1. Currently, with both the options of direct coin creation mining and multipool mining, the ability to influence the market is somewhat diluted. The dilemma is that if either were removed from the equation at this moment, it would stall or reverse the growth in awareness of the coin.
2. The only reason people have to stay with a pool long-term (which is in turn the only way to keep them from dumping their profits-- because they think the value will stay steady or rise) is the performance of the pool. Blackcoin did as well as it did because of the competitive performance of their BC pool with other multipools that paid out in BTC. Any multipool from here on out needs to stay competitive with LTC or whatever benchmark will be used to gauge profitability--especially now that more coins are enlisting multipool support, and the market is going to be that much harder to beat.
Now, these are clearly ideas for long and far down the road, and the dev has already done a lot, but who knows what the future has in store for PRT? I'm willing to wait and see.
