Beyond space...

As we all know, space is currently considered to be "the final frontier". However, once we have accomplished the goal of planetary colonisation, where do we go from there? What lies beyond space? Personally, I think that when you consider how it took less than 100 years to go from the wright brothers plane to the space shuttle, interdimensional travel could be possible within the next 1000 years. Of course there are variables (will we have blown ourselves up by then?), but apart from that, what are your thoughts?