Sony Alpha 99 does all that. Also the bitrate your HG10 produces is crap - 28 mbit/s AVCHD. On a pretty old canon T2i you get 43 mbit/s MOV which makes a HUGE difference in detail, considering it will be recoded by youtube, it also takes a videomic. I totally agree with hassle factor, but when it comes to video quality, modern camcorders are trash compared to DSLR or pentaprism.
DSLRs for video is trash. And a MOV file is more compressed compared to a AVCHD file but you probably know that so a 28mbps AVCHD file is more of quality than quantity for a MOV it's just quantity
Plus DSLRs can't really handle video blogs anyway, why? First, autofocus mechanism is pretty noisy. Next you don't really find a VU meter on DSLRs
Thirdly you can gradually smoothly zoom on a video cam, but on a DSLR? No way.
Zoom range? Videocams do this easily and you hold them better in your hand and how much do you need to spend for a decent 10x lens that is pretty silent at AF? More than 800$ that's for sure.
Usability? DSLRs = 0, i know that i have one, with Full HD 1080p AVCHD 24fps. It's hard to hold it in your hand to take a video! The weight will make your hand go all wobbly if you're walking and trying to take something without a tripod
And the last time i tried to work on MOV in Vegas 10? i had to convert it!
Sure the sensor is a little bit tinier but it responds with only 2Mpixels which with a 1/3" sensor makes for a better low-light sensor than a APS-C sensor at 18Mpixels