I agree with the more the better; if there is a motorcycle every block in urban traffic or every mile in superslab traffic, then the "cage" drivers will be accustom to seeing bikes and NOTICE THEM!!!. Rather than looking through them, as is usually the case in my location.
That was an unusual time. The Japaneses were making lots of affordable bikes to compete in the US market and over-produced at a time when the baby-boom generation was settling down with job and family and also when inflation hit the highest level of the second half of the century. I don't see any of those factors coming into play in the next 20 years.
I think the Tokyo Show is where bikes are heading. High powered semi-automatic scooters with near total enclosure, some climate control, full sound system, air bags, even outriggers that deploy when a wheel begins to loose traction. That could attract a lot of new interest.
I agree, more bikes on the road means more visibility for all of us, plus after the second or third time the newbies get the crap scared out of them there'll be a good supply of used cruisers and sportbikes to pick from. The problem with that is the bikes I like aren't the ones newbies are buying so it does me no good I guess. And every inexperianced or incompetent motorcyclist that gets creamed on the 6 o"clock news is bad advertising for us as well.
I think training and education are even more important when you have an increase of bikes, not just for riders themselves, but emphesis on motorcycle awarrness for car drivers as well.