I don't see any reason to replace Skype.
I see quite a lot of good reasons for it - but the site fails to list any decent alternatives. I don't think there are any at this point. To give you an impression of things that might speak against using Skype (not that I want to imply that these should matter to you. I merely want to speak for the 'I'd like to leave (but cannot)' side): 1) It's proprietary. We cannot validate the protocol without reverse engineerin…
IF, and I stress if, there is a better option, for users then I suggest use it. But arguments such as it was bought by Microsoft therefore it must be bad do not make sense. To be more specific, Skype had all the valid issues it had (such as proprietary format, advertising etc.) before it was acquired by Microsoft. The only new factor is its acquisition.
The fact that certain companies, Microsoft, IBM etc. have an 'evil', 'corporate' air about them, whereas companies (and this is a generalization for the sake of example) such as Google and Apple are the good guys don't make sense. I would like to see free software promoted for its merits, and to see bogus arguments based around who makes the product to disappear from the IT world.
No company is less evil than any other, and whether products should be used or not should not depend on who owns them, but how the products operate.