It's a fairly simple historical narrative:
Most of the life and creative vibrancy left the NES forum after the Frontier split. Only a few people remained in the NES forum as of October 2014, so EQ, the newly appointed mod, was left to rule over a wasteland. There were significant stretches of time during this "fallow fall" when the NES forum, one of the most popular boards in CFC, had 1 or 0 posts per day, something unthinkable several months before. It was in this climate, historically speaking, that EQ realized his games could no longer flourish, and he decided to turn to IOT as a ready source of population.
BSmith, who was humiliated into temporary retirement by having gutted one of CFC's richest forums through his mismanagement of the Amon Crisis, likely saw this as a source of redemption as well. Once the moderators were in agreement on this plan, it was a simple matter of rallying mass support around the nostalgic idea that a larger population would bring a return to whatever idealized past you (as a NESer or an IOTer) personally supported.
Things have moderately improved in the NES forum since then; at EQ's request I returned to lead forum games, and a few other people also rejoined. But in large part, this was an initiative promoted in alliance between EQ and a segment of the IOT population. IOT, a newer forum with fewer traditional rights than NES, saw this as their ticket to cachet and increased autonomy within the forum structure, while EQ saw this as a chance to revive a NES forum in alignment with his philosophies.
So, this really satisfies everyone except the Frontier NESers, who remain unconvinced that this will do anything but flood the boards with players who are unrepresentative of their style of NESing, under the rule of two moderators who don't like them very much and probably aren't going to change their minds any time soon.
Moderator Action: You should have heeded Plotinus's stricture clamping down on this thread. 3 points for major flaming (including elements of PDMA).
Please read the forum rules: http://forums.civfanatics.com/showthread.php?t=422889