I would like to second this opinion.

I am concerned that many of these products will not hit practical state until issues like power consumption and cost can be addressed. I don't want to have my device wired and I don't want my $1 dollar light bulb to cost $40.

If these guys insist on using JS they should compile it to 8bit code, so that we can better address to cost and power issues. Right now they have something that is larger than an Arduino. My gut reaction is that python might be a better fit.