Imho it'd be better to keep the systems as is regarding distribution of coins i.e. finite number and fees. An infinite number of coins will create inflation like crazy and people probably won't buy into it in the first place.
Obviously we then need the fees to reward people for forging.

POS/PON in general i think are great ideas. I think it'll be important to find the right balance between POS and PON. E.g. how long will it take me to forge a block with little or no NEM but a node that is running 24/7 ?
I think this could also eliminate the complaints from people that the rich get ritcher with the current Nxt - POS implementation.

Just to through out numbers to start a discussion - I think 40 % POS / 60 % PON could be fair. I think this would reflect that you're helping NEM more by running a node than hoarding your coins.

Thoughts ?