5th gate? Just build a new resort Bob.
Disney raised the rates for CBR. Pop, and AoA in the low teens % the year the Skyliner opened and again the year after vs 4-5% for most of the rest of WDW the year they opened. I tracked the changes. Those resorts have about 6500 rooms? Call it a $50 average nightly price increase premium (it’s probably more)? That’s $118M per year in increased revenue at 100% occupancy. Not sure what the Skyliner cost and what cannibalization from other resorts is but I gotta think they have done OK with it.Skyliner was bankrolled by the extra money Disney could get by raising the room rates of Pop, AoA, and CBR as "Skyliner resorts" and so that Riviera could be considered a 'deluxe.'
Other routes dreamed up by guests are imagined for their benefit, not for Disney's ROI. And if it turns out that the Skyliner hasn't been profitable... no more gondolas, ever!!
While Disney has considered other Skyliner routes according to insiders, they certainly ain't moving on them. Dedicated lanes for buses or light rail is more likely.