Perhaps real deflationary effects of bitcoin will probably kick in after 3 halvings (about 10 years?), when the number of bitcoin that is being lost naturally becomes greater than the inflation. However, at that stage, bitcoin fees would need to dramatically increase from what they are now.
This is probably a paradox of deflationary crypto-currencies: They need to raise revenue from fees to pay for validation/security, however if there's more incentive to hold rather than spend them, their revenue raising ability becomes constricted. Whenever this is true, I'm excited that we'll find this out in the future.