Video is lossy so this is a very easy thing to answer.
3. Many opt for other solutions than Blu-Ray such as a HD DVD (see google). And no, we can never be sure a HD DVD will play in all BD players. You'll figure that out pretty fast.
1) Will products like CyberLink PowerDirector and Adobe Premiere Elements be able to capture the HDV video from my Canon HV20 camera without loss - no loss when compared to the compressed video and audio that is now on the miniDV tape (HDV format = MPEG-2 25 Mbps for the video)? What format would I save it as - e.g. when I used HDVSplit, it saved it as an m2t file which is a container format (and I didn't know what the format of the video and audio were in that m2t container).
2) Will these products then allow me to create a DVD (std def) - using my computer's DVD burner - that will play in any stand-alone DVD player?
3) How about if I had a Blu-Ray burner attached to my PC - would these products allow me to create a Blu-Ray Disk - using my computer's Blu-Ray burner - that will play in any stand-alone Blu-Ray player?