While the loss of a trade factor is one negative, the costs of games can reduce since there's many factors removed in the distrubution process. Packaging, transportation and retailers all become obsolete.
Not to mention the irritation behind dealing with dipshit store clerks, delayed shipments, etc.
I'm sure trials and such will come along with digital downloads, allowing players to try out games for a certain time duration before buying. Things like this will negate the fears you have.
Or so I'd assume that'll be how it goes....