Hum no Celebro. For the surplus of NIC to be evacuated in plex, one has to buy the subscription time first.... What it would do is in fact a temporary increase of incomes for AC. It would correspond to the real currency value of the sub time "inserted" into the game market.
But, for one player to have a sub time, the real currency value must be paid beforehand. So there is not any problem of income for AC with Plex. The true problem with it is that you can now have real currency=NIC, wich imo is very bad for the game world balance, the "pay to win" parameter, that many of us dislike.
Imo any way of "buying" any ingame money, items, ect with real money must be avoided. The plex system in its essence is good for everyone. The problem is the guy that has 10K dollars that dunno what to do with them, buy many many game time items, then sell them at lower prices, *** the market etc... It makes the ingame world economy vulnerable of real money. So for me its a big no.