I already read that issue before. But somehow it died in 2015 mostly (at least I understood it so) because of incorrect OSM data...
For us make a lot of sense because it's allowed to put the bikes in the cable car and therefore you save a lot of effort.
Since GraphHopper is a great routing tool and komoot uses it, I don't see the disadvantage to include "aerialways".
I'm not a GraphHopper-Developer but if I would like to help you on this matter.
By the way, what's the big difference between "ferry route" and "gondola"? Only the profile, isn't it?
And yes, I did update all the connection points and the data on OSM so routing could be possible!