How much were they spending before vs. what is the traffic like?
I've seen similar impact going from Python to Golang, with less runtime errors/bugs to boot...
Did you miss out on the hype era of functional programming?
There was also less code, less bugs, and 0.01% of the talent pool.
I see quite a bit of golang talent out there actually, and crucially, golang is a quite "simple" small language to learn. At least enough to be productive... I picked it up in a couple of weeks.
We transitioned many folks off python or node in short order.