I suppose it depends on whether you count "lost coins" as a reduction in supply against the generation of new coins, and how high the rate of lost coins is in any given year.
Even "lost" coins are not truly lost. They're more like gold that has sunk to the bottom of the ocean. It will be expensive to get them back, but it's not impossible. And the technology to do it will get cheaper over time. Eventually a device that fits in your pocket will be able to brute-force a private key to reclaim the "lost" bitcoins. The people actively using Bitcoin will have long since moved on to stronger cryptography.