If you delete the resource , you will have to delete/outcomment the "and hidden-resource sparta" from the Spartan Hoplite recruitment lines in EDB, otherwise it will give you an error (and then you'll also need to delete the map.rwm in order for the change to take effect). But yes, removing sparta resource will make spartans unavailable anywhere. Best way is to simply outcomment the resource prerequisite in the EDB recr lines, that way you'll get Spartan Hoplites everywhere.