More likely, the mobile version has a potential customer base anywhere from hundreds of thousands to tens of millions, few of which could or would consider playing the original.
Meanwhile, the PC version just gets to keep existing until the subscriber base falls to the point it's not profitable.
Main thing, to me, is that because of this, they'll have some version of the game that's Unreal Engine based, and could (theoretically) be more readily ported and modified. Maybe they could more readily trim it down to an offline/coop type experience that more would see as a "legit" Final Fantasy entry, for example.
Reason i hate this is a lot of us were hoping and even suggesting on OF that they make PC a FTP with cash shop once updates ended, and instead they're doing the same thing but on mobile. Not only will that kill off the legit version of the game faster for those of us not wanting to start over and on a damn P2W mobile, but a cash shop could've been done on PC for those who were loyal to the game. Now it won't ever be because....nexxon doesn't want that
SE are truly turning out to be whores with the way they're handling this
Yeah I don't see how any of it will benefit the PC version sadly. Seems it will be phased out slowly but I'll stay optimistic and hope they keep both versions going and maybe people from mobile will wanna try the PC version. I think they should lower the monthly fee though at that point.
I suspect one of the reasons they haven't merged servers post-console is that they don't want to have to answer the question about lowering the monthly fee due to the use of less resources.
I also suspect it's totally possible to share character data via an API that nexon could use, but that would require them to create (or expose) the API and then get nexon to use it, both of which have time/money costs associated.
And I guess exposing more about the game than necessary? May be a security concern for them.
If we take a good look back at the Project Vanadiel announcements it would have been pretty clear that the only thing that actually benefitted the PC version from the announcements was Rhapsodies. Everything else was mobile only. The only thing they didn't specifically say (back then) was porting playable data over, but we now know that's not going to happen for sure, and quite reasonably so because it's so much easier and better (both in a general business sense and profits wise) to start from scratch given how radically different its going to be.. plus it's being developed by an entity that is both external and foreign.. So data protection laws would apply.
Like if you think about it, nobody expected to be able to carry over a save from FFX to FFX HD (and you technically could) but it kinda defeats the purpose of having a remake to play through again. It's also a messy endeavour considering how old FFXIs data is and how much more info each character has. ARR did data transfer but it also restricted the new game from doing quite a lot of things because of it (like ditching the class>job thing for those that already existed)
So like someone else said above, the PC version gets pushed to the back but gets to exist so long as it remains profitable.
In the Long run.. Perhaps the PC version might benefit (if it is still around) from renewed interest by virtue of the mobile version penetrating new markets and people are interested to see what the original game which the mobile is modelled on really looks like.