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Blame politics, greed and assuming control for that. Increasing the blocksize limit has been debated for 2 freaking years now. Back then, people are telling that "it's not necessary" since "we haven't achieved the same number of tx/s like Visa" handles. We are far from that, yes, but to think that we already need to pay a few dollars to get a few dollars going is nuts, let alone opposing the key reason why people should use bitcoin over bank machines and whatnot.
The blocksize debate actually goes back all the way to 2010. Furthermore the problem may actually not have a solution since with a falling block reward fees will eventually have to be used to provide an incentive to the miners to secure the proof of work.