HDV will be around for I'd say at least another 5 to 6 years. Professional cameras will start to stray from HDV, which they already have started to do. Canon will also most likely be sticking with HDV over the next 2 years.
The Canon XHA1 is the most under rated camera on the market and if I could pick any HDV camera out there, the A1 would be it. There is this terrible mis-conception that HDV sucks, which couldn't be further from the truth.
case and point, these were all shot on either the XH-A1 or the XL-H1, both of which are HDV cameras.
http://www.vimeo.com/pinelakeflms/videos/page:1/sort:newest
Hhttp://www.vimeo.com/pinelakeflms/videos/page:1/sort:newest