it is possible. The Prophet told us that a group of his ummah will never ceased to do jihad until the day of Qiyamah. Ulama' have all agreed that there are a few places in the world today that are qualified as jihad, and Palestine is one of them. Our main problem, from my personal persepective, is to find the right group to move as a jamaah in order to fulfill this obligation. If we don't have a leader and the right group (Islamically) that every able Muslim fighter can join in, then that's what we have to do first. Allah Knows Best.