My 2 centsback in '75 we though those gl 1000 wings were huge but just look at the 1000 next to the 1800 at the beginning
The same thing was thought of other bikes like the KZ 1000 but the GW was more than just CC's. That gave it a longer future if the company pursued it. Which they did and Kawasaki only played around in the market over time with no serious commitment.
Honda had years of no real improvements and were very late with tech and comfort improvments. (Fuel injection multi-port or throttle body, Heated seats/hand grips all now stanard, a real sterio not the old transister radio and anyone have CD's in the mid 90's?). This is where a serious competition could have taken the lead.
My only point is Honda left a hole that others could have taken advantage of. But they didn't. Just my 2 cents, neither right or wrong.