Why stop there? I mean if you're going for extreme situations, go big....
What if all the Levequest NPCs aren't there? What if the levequest mobs don't spawn? What if all the storyline quests stop working and your Grand Company locks its doors so you can't get in there? What if the Behest Warden has stopped coming around? What if all the side-quest NPCs stop asking for help? What if all the crystals required for crafting suddenly vanished, making that impossible? What if all the typically soloable mobs suddenly had an extra two zeroes added to their level and became impossible to solo? What if every other thing you could solo perfectly fine solo were to just disappear right as you're logging in?
What ever would you do?
Why is it that people have this tendency to come up with some extreme hypothetical problem, ignore all the obvious solutions to said "problem", and proceed to argue it as though it's some kind of valid point?
The mental gymnastics required to actually find such things rational must be amazing.
Here's another example, of which I've seen happen almost verbatim...
Person A: "I don't like how fast the leveling is. 1 week to level cap is too fast for any MMO".
Person B: "Oh, so I should like, stop talking to all my friends, quit my job, lock myself in my room and grind all day every day for a year just so I can get one level 50?"
That's almost a direct quote to one response I've seen. And there have been many others that were just as ridiculously over-blown and hyperbolic.
General Rule of Thumb: If you have to dress up your argument with hyperbolic details just to make it seem more "serious", it probably isn't serious to begin with.
I'll let them clarify for themself if they wish, but I don't think they were trying to say "there should be no solo content in MMOs". Even the most avid pro-group player I've met wouldn't say that. How I took it is "why is there so much emphasis by players on there being solo content". Especially considering there is plenty you can do solo in XIV even now.
Saying "well I'm not interested in any of that" isn't a good counter-point. Solo content that you don't like is still solo content.
If that's what they're getting at, they're right.
What do you see more of? People asking for things to be more soloable, or more group-centric?
In my experience, "more solo" takes it at least 80% of the time.