Ask my boys, and any kids out there now, what one of the most popular games is worldwide, and they will answer Roblox.
It is effectively an MMORPG version of mine-craft, which they graduated from.
In Minecraft they built stuff like Lego, now they role-play different scenario's.
I asked my boys what they were doing the other day when they were both sitting on the sofa each with iPad in hand;
"Oh we just robbed the jewellery store, and the eldest is driving us out in our getaway Lamborghini whilst the youngest is chilling in the passenger seat eating a pixel strawberry doughnut..."
Sometimes, I just see them running round a park like lunatics, or playing hide and seek, it's all completely inane, but they are making their own fun.
Check out the graphics and the link below.
Roblox - Wikipedia
Graphics really don't matter anymore, in fact UO Classic Client is way ahead of the graphics curve right now.
It is also way ahead of the content curve of all the console games that have had billions invested in them.
Content, imagination and fun are what matter in gaming. Graphics that are too realistic can hinder the imagination, so it actually helps a game to have obviously pixelated graphics. All the best games do. They are the ones that bring back nostalgia.
My boys look over my shoulders in awe, and want to play Dad's game, because they know Dad has the most fun, advanced and sophisticated toys.
I won't let them, I've lost too much of my life to this addiction.
Luckily for me, I started playing at 25, just after I'd completed all my studies, and got myself set with good grades and a career for life, or I'd be screwed...
All UO needs to do, is put itself out there.