Historically that may be true, but as the reward continues to divide, I don't think that miners will continue to make the same amount. It would require the price of bitcoin to at least double every reward halving.
it all hinges on adoption. for what bitcoin aims to be, internet money, it's currently a pitiful price. if it can't rise to accommodate more people and commerce then it's gonna be abandoned in lock step with the mining. it's a self perpetuating loop either towards success or death.