Yeah that is my biggest fear. I just want them to end up explaining all the major crap and the importance of why they choose certain things (the numbers, how characters are related, why some die and others don't, etc.).
Still 2 full seasons left. Thank god. I'm so ready for Season 5. Long wait though (January '09 I think?).
I guess next season is going to be about the Oceanic 6 + Ben going back to the island? Could be interesting.