I don't think that's really that interesting. Here's a better dream ... how many devices of the future will have a parrot VM? :-) Then it wouldn't matter what language you automation tasks were written in as long as the language could be compiled to parrot.

Others have mentioned that you can already control devices using X10 with Perl. About the only home automation that I would want would be things like turning the outside lights on/off at certain times, maybe the inside lights/TV/radio/etc. too with a "vacation" script, programming the Christmas lights to do something fancy, etc. The problem with using perl for many of these things is that the niche is well filled already. Take you alarm clock for instance. Programming it in perl would be cool, but it's already easy enough to set them for time A during the week and time B during the weekend or other such things.