It seems like there are fewer and fewer alt coins coming out these days. Is the rate slowing down, or is it just me?
Fewer, yes. The huge slowdown from the 2014 peak remains and hasn't really recovered.
There's a chart on Minki's landing page:
https://minkiz.co (reproduced below for convenience):
I've fallen behind a bit on the updates because I've been focused on generating documentation and examples for DOACC. I'll be updating the chart shortly (in the midst of reconciliation, atm) with the 90-odd coins launched since mid-Apr.
Cheers
Graham