Na, price isn't necessarily a barometer of disposability. If a
Halfords own brand is what you can afford, and if you *really* need a bike, you'll use it, heck, you might even look after it.
The Hero Hawk is £50 brand new in India, and I guarantee there will be examples being ridden in 20 years.
I suppose true disposability depends on how valuable the bike is to you in terms of its usefulness to you, and whether you could either do without it altogether or alternatively replace it with something better. If you can't do either, it's not disposable.
Having said this I do get your point, I suspect the majority of these will be skip fodder in 2 years in our society.