For what it is worth, real yields were incredibly low during World War II. Had TIP existed back then even this price would be considered a buying opportunity. Seriously. The sad part is that we're not actually in a world war this time, unless one counts asset bubbles as ongoing financial weapons of mass destruction.
That said, at some point the flight to safety in TIPS may be replaced by a "Holy @#$%! Deflation is hitting again!" Oil continues to crash too, which in theory is just not that supportive of TIP's price.
That said, I am perfectly fine holding all my individual TIPS until maturity. I have very low expectations about the future of economic growth in this country and current long-term TIPS yields merely confirm what I've been thinking.