Do you think that VoIP business will be ceased after releasing the bunch of free services like whatsapp, viber, skype, line, etc...?

ٍSure No,

Business requirements just like SSO and email integration using the company credentials with these system are not secured, Such system access Credentials must be controlled by the IT Team of the company .

So it is recommend to use the business editions social media solutions , like Office 365. 

No,

We have issue's with data security on free services like Whats app and viber. In this services hackers can easily stolen your data using different kind of tools.

No!

Data security is the major issue n case of free services like whtsapp and viber etc..

Data can be easily tracked using efferent kind of Tools..

No. In corporate world one could never trust free services because all of the free services have limitations. Furthermore the major concern is of data security, in free services your data is transmitted from public channel and anyone can track it using sniffers tool. So to avoid sensitive data loss one has to deploy their own services.