Until very recently, I'd have said that email was the gold standard for business communication - but personal communication is more often going through other social media channels.
I would have said that any service providing good business email would be highly likely to survive.
Recently, however, I am seeing businesses using other methods to communicate - such as online meetings, whiteboards, cloud resources and online chat. Money issues aside, I suspect to see email as a medium reducing and only the best providers surviving long-term.
(That's my view from the UK. YMMV)
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