There won't be that bad of a dry spell...if developers were thinking the system would launch early next year like around March. Say the 3DS launches in the October with 3 First Party Games, and no 3rd party games...unlikely, but still. That means that you have 3 games to play at launch, and most likely 3rd party developers will trickle their games 1 or 2 a month until around March when a flood gate of games would come out.
That doesn't sound too bad...specially if you also have regular DS games, DSi games and other downloads. A portable virtual console, and more.