That's what the various string theory proponents start from. There's "too many" different subatomic particles, so there surely must be something smaller that they're composed of?

How long can you break something apart until you cannot any longer? The things we are breaking apart are illusions in a sense. There will always be a smaller particle because that is what we are looking for.

When we understand that everything that we see is a manifestation of a probability wave, then we will understand everything is a wave and end these foolish experiments.