it's not a binary question, it depends on who is asking. If someone is asking who has limited resources or time to invest and not access to a lot of engineers then the realm of what's commercially viable shrinks pretty quickly.

If you have someone who has the resources and time to experiment, then sure everything that is literally viable may be viable.

In general, it's probably somewhere in between. I wouldn't take one or two companies or even solely proprietary companies as a good example though. For the average person it probably matters most if a language has a rich and alive open ecosystem.