I think a lot of people learned Eagle. Let's face it Eagle was smart
I think they were also lucky. Arduino used it, and that was all she wrote, almost every single newbie and OSHW company (Adafruit, Sparkfun et.al) from that point on also used it.
I don't know Dave, Eagle was around before the hobbyists started using duinos. I remember 15 years ago when things were a lot more 'lean' in the mid to low priced EDA community and Eagle was giving these, around 10cm square programs, out for free (with their standard yearly award from the same magazine!) and a lot of people started using it. I even remember the guys in Circuit Cellar posting circuits in Eagle. I tried it but it was one of the most cumbersome programs I've ever used, especially coming from Protel. I plugged away, finally threw in the towel.
Again, don't underestimate not giving up a program you invested time learning. That's why I tell people, time is money, sure if you're a hobbyist and can play around then free programs will probably work for you. 1600 bucks for Eagle is way over priced in my view.
I'll watch CS as I'm interested in how it will pan out. I'll bet at 1K it sells like hot cakes and that might be enough to get a strong community of users keeping it afloat.