I thought G Gundam, Gundam Wing, and Gundam X were planned as celebratory series for the 15th anniversary of the Gundam franchise. I mean, they weren't all completely planned out in advance but at least a few years ahead, they decided to commit to three new Gundam projects to take air during 1994 through to 1996, with 1994/1995 being the 15th anniversary. They literally aired back to back, with the first episode of Wing airing exactly the week after G Gundam's finale, and the same for the premiere of Gundam X, meaning they negotiated with whatever TV station it was airing with to lock in for 150 episodes (which ended up being less due to Gundam X's cut ending).
That doesn't mean I haven't heard of the 90s being a bad time for Gundam. Supposedly Turn A was going to be a swan song for the franchise, with Tomino's own hand in the work after not having touched Gundam since Victory. A gap of just 5 or 6 years doesn't sound like a lot, but there were a lot of animated projects in between Victory and Turn A. Also, there was some muttering here and there about Seed having revitalized the Gundam franchise for a new era of fandom and bringing in moneybags for Sunrise/Bandai.
On a related note, I can only find Bandai's fiscal reports dating back to 2006, nothing else earlier. It would have been nice to see figures for how well Gundam was doing in the 90s. Something interesting to note about the latest 2018 fiscal reports are that Dragonball's profits have surpassed Gundam for what might be the first time, knocking Gundam down to 2nd place.http://www.bandainamco.co.jp/en/ir/library/result.html