Well, viewing figures might not rise dramatically more than they are currently, but that's not to say the number of people who want HD broadcasts won't. As Freeview HD sets become more common, the number of F1 fans who want it to be broadcast in HD will increase. And that's just in the UK, let alone the rest of the European market.
And for F1 fans, yesterday's race wasn't boring - like any sport, you have to understand the nuances and subtleties of it to appreciate it. My other half was drawn more and more into the action as I commented on what was going on with the Red Bull and McLaren tactics (much to her annoyance after a while as she was trying to get some work done!). It's similar to when you sometimes hear people who don't generally watch football commenting on how dull a match is because there haven't been 18 goals in first half - quite often, the quality of football on show can be fantastic but it's lost unless you know what you're looking at.