I think this is where the reasoning behind this theory will have more credibility with the big switch on at Cern and its collider could start a timeline where future time travellers could step back into our time on the very second they manage to fire up the first successful experiment and create black holes and such, although the black holes they will supposedly produce will be miniscule and in our time nothing could pass through the wormholes they may or may not produce, who knows what technology future science may produce and todays obstacles may be a breeze to overcome by future man.
So although it sounds like a bit of geeing up the band of journalists that are bound to descend on the complex on that day, whose to say whether future travellers may not appear in a few months time?