Its true that it is perfectly rational for an individual to discard an address with 0.0002 BTC or less because it is insufficient to cover the fee for spending it or combining it with another balance.

If one million people do that then 1,000,000 x 0.0002 = 200 BTC will be lost from the bitcoin money supply.

If that happens each year, then the money supply will experience a resulting annual deflation of 200/11,000,000 = 0.00182%

Thats nothing to worry about IMO