It's a bit sad that Atlus is dropping the online support sooner than most expected, March 2011 is less than a year from now.
But there's a slight misconception in this thread, regarding the events in the World Tendencies. All the world tendency and character tendency events are very doable offline, that's how I got my platinum.
It requires a much tighter progression pattern right from the moment you kill the Phalanx, that's true, and it also requires that you play the entire game in Soul Mode, in order to achieve Pure White WT and then spend a large amount of Stone of Ephemeral Eyes, while constantly dying in Physical form in any world you want to drop from Pure White WT to Pure Black WT.
Plus, since in order to achieve Platinum, you have to do at least 4 different playthroughs, missing an event in one of the playthroughs isn't that worrying (but I would at least recommend to do all the Pure Black WT events on the first playthrough, as starting from New Game , the difficulty has that huge increase spike).
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
