I think a rewrite for the reason of relying on javascript. Not everyone has, or wants, an iphone. Those with BlackBerrys and most normal phones do not have perfect support for Javascript; I deliberately turn off javascript on my BB when using it over-the-air due to the extra rendering time required. In fact, even for computer browsers basing sites largely on javascript is a bad idea; It lags badly, takes a long time to load and has a habit of crashing browsers.
All very good points.
On the topic of mobile devices
I think that this should be a non-issue. In my opinion, even with bigger displays, phone should not be used to browse non-optimized web sites. If you wish to make your site accessible to mobile devices, you need to go beyond the Javascript issue and offer a fully alternate set of pages that fit a phone screen. This would be one of the things offered in a reworked version.
On the topic of Javascript slowness
Having now a few years of experience coding Javascript, I have come to realize what was not obvious to me at first: many web sites give Javascript a bad name by abusing it and not caring about sending 100's of KB of code to their users' browsers. It's a mistake that can be easily avoided. A beginner's mistake, that I myself made.
The BlackBerry actually does a fair job of formatting pages for it's screen, the problem comes in pages whose core functions leave no alternative whatsoever to Javascript (Such as submit buttons and links which simply is not nessecary). A reworked version would be an acceptable solution.
That is true, it is not the use of Javascript that is the problem but that badly written usage of Javascript. Just think: "Where do you actually need to use it? Does it really need ajax slid-outs for everything?"