Except TripIt hasn't seemed to have made any advances in their product in 5+ years. (Getting acquired by Concur certainly didn't help that.) It feels like it's 10 years old, and I'd LOVE to find a good competitor.
Someone upthread made a good point that TripIt being for business travelers. There might be room for a simplified app for personal use.
I mentioned in another comment that I've been working on something targeted more at the personal vacation space: https://www.naverator.com
TripIt is good for business travelers and works for personal, but it's very utilitarian. I definitely see space in the market for something more visual & pleasure-oriented.