My thoughts from an observation from this thread.
Okay the niche problem for graphics to have the ability to fully become HD into 720p 1080p 4k-ultra high definition is stuff like consoles not supporting that feature and being out dated to it while more smart tv's/monitor, desktops, laptops with hdmi out even will have that ability to adapt much easier than consoles ever will simply because most consoles unless your a very techy guy who knows it well enough will be stuck with the graphics card and type of software they have been given when they were created among other tech that was put into them at the time which is how or why they will make there money off creating newer consoles as well.
Sorry getting a bit off topic but you can see what type of system ffxi is currently using to be played on and it's also partly why it has it's downfalls into having the ability to have upgraded graphics and if they did a remastered version of it, it would have to exclude certain technologies that it can be played on into having that ability to retain the higher or the ultra high definition graphics to be seen while playing the game. well just stating it can be based on the games prime/primary mechanics into what it is running on or primary mechanics to run the game.
Now for long term play of the game. We all know some of the obvious outcomes but i'm sure SE is seeing some players don't want to play ffxiv/other games or they've played it up to a point of being done with other games/ffxiv and not liking that play style of the game anymore thus they will just play ffxi for the long term.
Some will leave because of boredom or leave the game if all of there friends have left for other games and of course there are those players who will stay for the long run regardless of their friends\folks leaving or all ready left the game which they've known for quite some time.
Life's factors in our lives could pull the game down but will stay with the new player base and long time players who cant stand to leave the game since they are beloved of ffxi and it's changing play styles. meh, I guess i'm trying to say is this game will keep updating and changing because of its fan based feed back to the ffxi teams in order to keep the game running for a very long time to come which keeps the game in a power point edge into wanting to be played.