Expanding upon that, what are some possible ideas regarding how modern speakers could be perceived by speakers of older forms of English? Would it be basically incomprehensible?
This was answered pretty well here
http://www.reddit.com/r/AskHistory/comments/17a210/what_is_the_furthest_back_in_time_i_could_go_and/
Hi! This is one of the most popular questions in this sub, so if you're interested in more info/examples, there are a few more posts in this section of the FAQ (see link on the sidebar)