You kinda do. What do you think we did before slack? Change can happen the same way; convince the people with power to make the decision to use something else. There's always some resistance because you have to get many people to change - start with your team, convince others to join another service.
We use slack and I still have to use 4+ other forms of communication at work daily (jira, confluence, outlook, github). Sometimes we use video chat services and conference calls as well. There are days where very little happens via slack, and I'm becoming increasingly convinced that anything beyond pinging for simple things (hey look at this jira ticket, have you done this?) is wasted effort.
We use slack and I still have to use 4+ other forms of communication at work daily (jira, confluence, outlook, github). Sometimes we use video chat services and conference calls as well. There are days where very little happens via slack, and I'm becoming increasingly convinced that anything beyond pinging for simple things (hey look at this jira ticket, have you done this?) is wasted effort.