The idea is close but using GSM for internet locks you into a reoccuring monthly fee to keep it working -- stop paying the fee and it becomes just another scale. If it worked over wifi with the ability to access the information on my local computer (and not just via the website) and kept the $119 price tag I'd be interested.
I understand that I'm not a typical consumer, but I am a typical early-adopter.
I'm wary of uploading health data (however innocuous (weight) to the web). It's only the beginning; the web-connected eScale reminds me of these hypothetical "Huggies Smart Diapers":
I understand that I'm not a typical consumer, but I am a typical early-adopter.