Is there any trouble that I would be causing if I deleted 3 columns we are definitely not going to be using.

1) url
2) contact name
3) contact email

I just don't want to do something short sighted, but I see no use for these columns (for our content management purposes -- only internal folks will be able to update the system, and we are not using it for a links directory.)

Are there any problems with deleting these columns?