Jayanand-
I agree with most of what you say on this. The investment in learning a system is really important.
My thought is that Adobe might well be heading out in a path to a "larger" market (much like Apple has done) at the expense of the top end users - photographers - and blend Illustrator and Design with photography rather than continue to be the best at Photography as a separate category.?
If that happens, I think that Cap1 and On1 are both dedicated to photography with a camera as God intended :-)
If Adobe stumbles, I think anyone proficient with Photoshop and Lightroom will have very little trouble using either of these apps. Integrating all of your plug-ins might be another issue but I have to believe a surmountable one.?
cheers,
Tom O'Connell