I actually deleted the two files (using Root Explorer) when I first rooted. Absolutely no ill effects over a period of several weeks and, I believe, a lower battery usage.

One problem you might see is that any of the battery reporting apps don't understand that there is no cell activity - for example "Android System Information" continues to report a "cell phone idle" statistic even though it's meaningless. I did notice that before I deleted the two apps, this statistic used to be about 10% - now it's running about 4%