arati,
Hi.
Since I doubt humans have ever experienced (and been able to record in a codified manner) the sort of dramatic magnetic reversal that is theorized I would say we have no idea what to expect. Perhaps the idea of dimensional shifting will attain some fruition as a result of a temporary magnetic collapse. Perhaps some people will more directly experience 'other dimensions'. However, some of these 'dimensions may simply be other aspects of themselves not heretofore needed to cope with 'shifts', or whatever.
As for the rest? Fine stuff for video games, play stations or whatever. I doubt the basic physics of the universe will allow for them in other than virtual environments.
Cheers,
RC