I was just about to post this... I reckon it will spread to 1channel etc. before too long.
I suppose it shows the need for addon coders to always make the site base url (ie. 'http://www.movie2k.to/') definable in addon Settings, so that users can manually set a proxy, or select from a list. Looking at the movie2kproxy.com, it looks like it slightly changes the html layout of a page which might break the scrapers.... guess maybe the best way to approach it is through cleaning the html layout to look like the original page, rather than adjusting each individual scraping regex.
Also I wonder also if XBMC addons might hurt the bandwidth of the proxies, some of them are pretty slow - it might require a snippet of code that randomly chooses a proxy from a list, on addon start up.