Uhh, no. This has happened untold times over the course of the planet's history, and to my knowledge, Earth does not look like Mars. I suspect that pattern will hold true.
The earth's magnetic poles flip every so often. The worse we will get are more instances of skin cancer. The magnetic field isn't going to collapse and most of the radiation will be kept safely from us by the atmosphere. Considering that the field is nearing its flipping point, we are pretty much close to the worse case scenario already.
Actually, the Earth will end up as a burnt up cinder after the Sun enters it's red giant phase, but you have about 4 billion years before that's due to happen.
That does not even matter, seeing as our Galaxy is on a collision course with another galaxy ( I think it's Andromeda). We could definitely boil before the Sun even has a chance to boil us.
That does not even matter, seeing as our Galaxy is on a collision course with another galaxy ( I think it's Andromeda). We could definitely boil before the Sun even has a chance to boil us.