I think the big breakthrough will come with Quantum physics. I read somewhere that scientists studying in this department are on on the verge of a big breakthrough in proving scientifically that there are many more dimensions than the ones we know. They say it is only a couple of years away and if this is so then maybe that will be all we need. If they can prove these dimensions exist then ghosts will be the next thing.
The thing to keep in mind is that the "dimensions" referred to in Quantam Physics are purely mathematical constucts. They do not represent a physical entity.
It is kinda like saying: "If we had cubic chickens, then we would have cubic eggs".
Well, yes, but since we don't have cubic chickens, and we don't have cubic eggs, so it doesn't really matter very much.
The same applies to Quantam Physics. The math is very complex, and in order to solve some of the equations, some creativity is needed. Ie: cubic chickens are invented in order to make the math work. Except in physics, they aren't called cubic chickens, they are called "dimensions".
On the other hand, cosmologists are saying that the universe is mainly composed of "dark matter".
They don't know what it is, where it is, what it looks like, or what it does or how to tell if it is standing right next to them. But they say it is out there somewhere, and there is lots of it.
So what's the difference between "dark matter" and a ghost?