edit: To not abuse the quoted author.
For D2R it would be a great option the have ploot and FFA both side by side.
Ploot is not the curse.
The way ploot was made in D3 and the missing trading are part of the D3 desater, but not the only guilty for it. PoE shows, that there are options to modify the ploot and trading system.
For D4 we can expect a ploot system and that is absolutly fine. (Hopefully with a good trading system.)
So here you can learn, why ploot is not the curse.
Have fun!
(click open to read).