I'd love for PG to spent more time per month on Arc, since to me personally it's probably the most interesting thing he does. I enjoy his essays and think YCombinator has produced some great startups which I sometimes use, but Arc is more interesting to me than either of those things.
With that being said, I knew all along that Arc is an experiment in trying to make a 100 year language, not something that was intended to help me deploy commercial applications as soon as possible. So I've played around with Arc a little and been happy to have the experience.
I'll play around with it more as it gets more advanced and gets more libraries and such. Until then, I'll remain a happy Python programmer and look forward to whatever PG and the rest of the Arc community slowly end up evolving towards.