I'm very near completion of my Nexus weapon so I'm not actually going to get hit by any of these concerns but I do still find them quite worrisome. When Nexus was released I initially applauded the Light acquisition process, especially following the rumour that the light earned was variable based on a number of factors that would encourage players to do a variety of content and to really play the game in general. Since then, however, the following things have become painstakingly evident:
1. Anyone who didn't have their Novus weapon, or who didn't start farming light as soon as this patch hit, is at a serious disadvantage:
I really enjoy time-attacking instances as all of us Novus owners burn through our upgrade but I am keenly aware that there will never, ever, EVER be this concentration of Novus owners in the game ever again. Right now, farming is fast and efficient. You can easily form a Light farm party in PF and spam the most efficient bonus window in a 6 DPS party . Every day, though, as more and more people finish their upgrade, this becomes less and less the case. Within a few weeks I anticipate that dedicated light farming will be pretty dead, especially outside of DF. This will be bad for everyone, but especially bad for DPS.
Even if you were to finish your Novus today it would be considerably more difficult and painstaking for you to upgrade it to Nexus than it has been for current Novus-owners to upgrade theirs. Without SE keeping a very close eye on the concentration of Novus owners on servers and adjusting light rewards carefully and in a timely fashion, the Nexus stage will be very unfun and disheartening. What the swarm of Novus-owners was able to complete with ease in a matter of days will very soon take the most dedicated grinders a weeks or months unless the content is intelligently adjusted.
I foresee this being especially bad for player morale because:
2. The same people who will be at a disadvantage in this stage were already placed at a disadvantage in the previous stages:
With the addition of Atma, some players were able to complete their Atma sets with extreme ease while others took and are still taking hundreds of hours. In subsequent patches, despite the obvious issues with reward balance, it was the Animus and Novus stages that were made easier via greatly improved Myth acquisition and easy-to-get Alexandrite, causing the luckier players to leave those still on Atma in the dust. Being able to respec your Novus materia somewhat alleviates this as a player can put cheap materia on their Novus then slowly upgrade it over time if they're having a hard time affording what they really want, but they'll still have a much harder time getting light as of about right now.
3. Unless carefully controlled and remedied, this trend has the potential to continue and worsen for the rest of the game's life.
With the exception of a few dedicated people who manage to get their Nexus done outside of this current and expectedly short-lived light farming golden period, it will be the same combination of lucky and hardcore grinders who are ready to commence the next relic stage who are finishing their Nexus right now. This especially concerning because people hit a disturbing grind-wall with Atma stage, and now, as more and more of us finish our Nexus, they're going to hit a disturbing grind-wall with light farming, one that wasn't nearly as bad for us.