It's not a loss to the sector to lose somebody who thinks the path to doing that is intolerance, dominance, lack of accountability and an insistence on some Ayn Rand-ian gibberish philosophy of the World.
He was intolerant of Gawker. He dominated them by suing them to the hilt via the Hogan case. He is anti-regulation which in this case is a synonym for anti-accountability. Most of his political and economic philosophy seems to be the same gauche pastiche of SV's obsession with Rand. So, yeah, good riddance.
If software is eating the World, it's important the people building and operating it are as diverse as possible, otherwise there is a risk it unconsciously or consciously becomes biased in its actions and consequences towards a single social group at the expense of others.
Of course a one-party political philosophy is a problem in the long term, but so is Trump's stance on equality - one Thiel endorses - and for now at least it's important the voices of diversity and accountability win out for the long run.
TL;DR: Bye! Don't let the door hit you on the ass on the way out! Come back when you've got a little more mature and empathic towards others if you want!