Corporate Verizon can easily handle it, but not the corporate Verizon stores. Many of the stores are relatively small. I have seen our 2 local stores packed with people on a weekend when there were no new phones being introduced. The wait to talk with someone was 10 or 15 minutes. Imagine what the wait would be if the iphone and TB were being introduced on the same day. Remember the lines outside of some AT&T stores when a new iphone comes out.
Now this makes sense, and also explains why no firm date has been set. They'll wait until the IPhone rush dies down, that could be 4 days, or a week, or longer.
Still doesn't explain why they planned/announced the TB for the 14th or whatever in the first place. Like I said, it's not like they just found out last week they were launching the IPhone.
This is their first LTE phone. I have to imagine we'll see some TB commercials at least 3-4 days before launch.