Advertisers will adapt to this if it becomes ubiquitous. Logos will be replaced with color schemes, etc.

Also this tool could be terrifyingly hackable. Imagine someone hacking into your vision.

So do HTML tables but that doesn't make them a good idea.

jQuery is just like any other framework. You can't really compare HTML tables for layout to using jQuery...

It's taxing on development and introduces unnecessary limitations. If jQuery is just like any other framework, <td> is just like any other tag.

Im confused what limitations are you refering to? anything that you can't do with jQuery you can still do with straight java script. Just cause you use the framework does not me you are shackled to it. As for the using tables.. these two things are fundamentally different one has a place and is horribly misused when used for layout. The other is a framework that adds a wealth of functionality and additional functionality via plugins.