If someone posts something you disagree with in this forum, you should assume they have that opinion genuinely. Trolling here is a direct insult to the Dev team and staff in general since they attempt to consider playerbase opinions and ideas posted here (even the bad ones or the ones people forget about). If you think only a complete idiot could have an opinion expressed here, then silently believe that the person that posted it is a complete idiot, and if they become disruptive, then staff will handle it.
On the topic of this thread, though, I would say that a cast time on Exodus would be redundant with the Quick Evacuation AAs and turn it into nothing more than a normal evac spell that doesn't have to take up a spell gem but would be problematic to use if the caster is being interrupted.
The ideas of adding a downside to the group aggro-wipe and evac with the spell is reasonable. I would think an FD and mez that lasts long enough to make sure the previously engaged NPCs reset (to lessen abusability) would be an option. It would ruin my current use of the AA as an occasional "I don't want to run across this zone, I'll evac across, wheeeeeeee" button, but I suppose that's fine.