There is such a thing as progress, and in my opinion the way you get it is by spending lots of time trying new things and seeing which ones work. So I'm in favor of "leaving a language that was working well for them just because of some hype."
You can try new things, but abandon the other ones because of hype (or thinking it's better cuz "ppl who don't know anything about languages said so") instead of true technical merit is pretty fucked up :)
Now then again Go ain't bad, but I don't see it being better enough than Python to switch in this case. Python in better for many things as well. Not a large step enough.
With mass globalization of the hype, we have countless examples of hype - even for programming - around things that aren't especially good.
Marketing people know that pretty well.