If my understanding is correct, when we hit 10.000 diff, then the chainsperday value will change to a much lower number since its related directly to the whole integer value of the difficulty.
If you only have one (or a small few) machines then you probably wont see a block each day anymore.
I think it is mistake, because longer (>9) length chains are ignored when the block-found probability is calculated. See
http://www.peercointalk.org/index.php?topic=695.msg6311#msg6311 If the longer chains are included, there is no jump in block-found difficulty when the network difficulty goes over an integer limit.