that wouldent stop people from using it anymore then they do now... a 3 con dsent effect you much really.. sure sure less hp... but i dont know about everyone else but i dont teleport into active spawn points... so id just wait 10 min and rest... wouldent do must more then bug i think. If there is a proablem with the teleporting, make the level to get it higher so its rarer. Making it so you cant use tell level 17, when you get 9th level spells, makes sence and will surly lower the amount of folks using it.
Then again i dont know that there is a proablem with the system as it is.