What about the opposite: Could the deal go south and drop below the initial offering price on the first day? It's possible, but I would bet against that as well. This is THE big initial public offering (IPO) of the year. The book-runners will certainly be expecting buyers to be on their best behavior.
That means keeping flipping to a minimum. Additionally, while they cannot make any demands, the underwriters will also likely expect the buyers to have aftermarket orders to support the initial price.
What about a technology glitch? Yes, it could happen, but there are many brakes in place.
First and foremost, the stock will not open unless the man in charge says it can open. That would be the Designated Market Maker (DMM), who is the man on the NYSE floor in charge of trading the stock. If there are still orders that want to get in, he gets them in and adjusts the price. It doesn't go public until he yells to the crowd (and the book-runners on the phone) that "The book is frozen."