I would trust Gabe's judgement 100%. Dude runs one of the most pro-consumer companies in history. In doing so, he has built a fiercely loyal fan base by simply being good to his customers; not trying to squeeze them for every single cent.

Gabe is a rarity; part of a bygone era of business owners and software engineers who truly care about their projects and want to build things that they themselves want to use and play. He's a smart man and Valve has been his baby since he left Microsoft. He'll make sure it's in good hands when and if retirement comes calling.