It seems like they've badly over nerfed the amount of Sorc's Knowledge, and your 'average' player will likely fall 1-2 pieces short of the full set.
Keep in mind, the forum community is only a tiny minority of the over player base. Only the most active players will use the resources like Platinum Leaf/Gems of Knowledge. (ie: those players who are typically part of top active Fellowships)
I'd hazard a guess that most players will likely just go with whatever beacon
they think is 'best', and will thus likely spend their currency less efficiently than the majority of the forum users will.
Those that do, will obviously be relying entirely on sheer dumb luck & winning at least 1000-1500+ bonus currency to maybe grab the full set. And your 'average' player will likely have to rely on winning even more bonus currency, since I highly doubt your average player does more than 2-3 sweeps of their city for the incident drops!
(myself, as what I consider a 'very active' player, tries to collect the incident drops around my cities every 2-3hrs, which will net me on average 28-30+ drops/day, and of course, further increases my odds of getting 2's or 3's when I collect the fallen scrolls!)
Otherwise, the only way for plenty of players to get the full set will be to open up their wallets and/or spend their diamond hordes they've won via the Spire. (...the latter option being far less likely for 'average' players, since it seems most fellowships struggle to even hit the Lv2 'silver' trophy rewards!)
I have a sneaky feeling that INNO is going to get a right earful over this event, as they've probably hung the majority or their player base out to dry because the devs are just god-awful at basic math.