Absolutely.

Personal Teleport only until at LEAST level 6-7, and even then having a significant mana cost per unit, and perhaps even a turn or two lag in casting.

As stated many times elsewhere.

+1

Personally, although I don't dislike the idea, I would prefer to have Teleport being limited in range. Instead of being "go anywhere in your ZOC", I'd prefer it to be "go anywhere in a range of X". And that the spell could be empowered by spending extra mana to increase that range (would need some visual feedback to know the range and how it increases by each empowered mana used).

I tend to use channeler armies (if you thought that forcing me to waste all my action points for casting a single spell would stop that, you are wrong). As Teleport is now, I would only need some meatshields awaiting for me in my destination point while my champions teleport there one by one. Even if the other city is in the other corner of a huge map.