The way I personally see the hobby going is one of retraction.
This is simply because kids cannot buy 'traditional' 54mm figures in the toy shops.
You really have to start an interest early for it to take root and grow.
When I was a child we all played with toy soldiers but now this is not so common.
Apart from poorly made copies of Airfix what you now find in the stores are the PAPO, SCHLIECH, ELC, EPIXX and PLASTOY style of well detailed and painted larger size figures. The unpainted 54mm figure is now only found in a few model shops and at the toy and model soldier shows and are bought in the main by adult collectors.
Many plastic collectors now react to the large figures in the same way hollow cast fans did when plastics came along in the mid 50s - because it's not something they knew and grew up with it's either ignored or treated with fear and contempt.
In 20 years time there will be a whole new collecting generation who will be looking for and paying high prices for early Papo style figures whilst the 54mm collectors will be in a diminishing minority, much the same way collectors of Hollow cast are today.