Stephen Hawkings once told that we humans have not yet discovered 1% of the total things in this universe.Which means that there is more than 100 times of things we have now,yet to be discovered.But there are many limitations even now.So let us hope that more and more elements will be discovered.And when time comes,there may be an element with atomic number 1000.But it will take time...atime...a lot of time.