That's a good point, but I don't think that'll be a significant psychological effect in practice. Terminating less popular services (like Buzz) early in his reign doesn't make me doubt their ability to follow through with products like Google Voice or Chrome PCs. I think it's more likely to have an opposite effect: it shows good judgement.

Things may change and a formally-promising product may start looking grim. At that point this decision may make that product's future seem more uncertain, but I'd expect uncertainty to be dominated more by the product's poor performance/grimness.