Tim is
kind of boring. The iPad announce lacked flair, dynamism or charisma.
Tim is not a disruptive kind of a guy, so Apple momentum will continue for a while, but there's zero evidence he has the vision needed to keep Apple looking super-shiny - either from a product design point of view, or a marketing point of view.
There's a real possibility of Apple drifting back towards the Amelio days of sort-of-interesting boxes and software that get better specs every year, but no real vision for the future.
Tim did say 'post-PC' a lot so iPads will continue to be important. But really, moving professional customers from professional hardware and software to dumbed-down slower and less fully featured app-format software isn't necessarily a win.
In the final years of Steve, Apple basically became a toy shop. There's a lot of money in toys, but I wouldn't want to bet on toy sales as a business model with staying power.