If they do decide to include the database they better hope it compresses well. My data directory for bitcoin is at 1.8GB and growing. That's only with 131340 blocks AND an empty wallet that has not yet made any transactions. Who knows how big it will be in five years

That's odd. Mine is a bit under 450 MB, and that includes some relatively large logfiles as well.
Here's what I have in the bitcoin directory:
debug.log 595 MB
blk0001.dat 262 MB
blkindex.dat 128 MB
10 other files for 28 MB
In the database directory under the bitcoin directory there are 89 files of 9.5 MB each for a total of 845 MB. Grand Total of all files: 1.858 GB

Do you restart your client often? The debug.log is just a logfile that is recording events that your client considers notable, such as restarting. You can delete that without a hickup, and the client will just start another upon the next restart. blk0001.dat is the actual blockchain while blkindex.dat is the file that your client uses to quickly find a particular transaction within all those blocks. I would still recommend that you backup your wallet.dat file before deleting anything, though.