"Ready for prime time"? Erlang has been used by Ericsson in one of their flagship products for years, as well as by Motorola and T-Mobile. More recent examples are Amazon and Facebook. There are lots of people out there getting real work done with Erlang, many of whom say that doing it in anything else would be a major pain.

The line number issue may be an oversight, but in no way is it a flaw or something that's not there because the OTP team don't know how to do it. Concentrate on the real issues, such as the ones Joel Reymont is talking about.