This post made me laugh. There's so much irony here.
Coming from an old gamer who played the Ultima Online when it first launched, played EQ when it was relevant, Ascheron's Call, ect.. Timesinks were never enjoyable. Convenience is not as equally bad as Pay to Win unless that convenience is pay to win. Which generally means you buy your gear, you buy you high level you buy stuff to augment your character. It's never usually associated with buying playtime, which is really all this is designed to do. Plex systems are no more than additional revenue for a game that is stolen by RMT companies.
RMT transactions are going to happen regardless of what you do. Even in the hay day of games like Everquest, Lineage, FFXI, ect.. RMT was present. The question is.. would you rather that money go in to the pocket of some asian based farm company complete with bots and tell spam that are quite literally making an unliscensed profit off of the game and destroying the game's economy? Or would you rather it go into the developers pockets? Not to mention the resources they spend on combating RMT that they could use elsewhere. RMT would still exist, but it wouldnt be near as problematic as it is currently.
Not only that but it affords players the ability to play the game to pay their way in.
This isnt a system that destroys or ruins games. It doesn't take away from the journey or take the point away. It works very well for a game that is accurately designed for it to work. FFXIV might not be that type of game But if it made SE some more revenue and curtailed the RMT issues this game faces then I'd be fine with it as long as it worked out well. The problem is, as I stated previously This game's economy is too weak for it, and that's just a starting point. I won't even touch how multiple servers and everything else would affect the system to a degree to render it an unstable payment method at best.
As for WoW.. I hate to burst this bubble and bring you this Sunday Paper, but this game's already went down that road. Your third to last sentence, describes this game to a TEE.