i am doing my RHCE now and willing to do further certifications in virtualization,storage & cloud.. Are these courses having value?? Though i know that getting placed is directly proportional to subject knowledge and skill, i want to know approx job vacancies in few years.?

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You're asking us to look into a crystal ball! No-one knows what the job market will be in the future.

However, I notice that quite a lot of Sys Amins/Programmers and other computer people (on the Linux/Unix side) appear to be on the, shall we say, "older" side.

I'd reckon that there's likely to be a need for "new blood" to take over when the older generation retire.

Just my

I'd reckon that the courses you mention, plus associated experience would hold you in good stead.

Go for it!

Play Bonny!