The thing about a new party is that it has to be based on some real, coherent constituency or perspective. Otherwise it just doesn't hold together, you end up with a group that just fractures.
You can see in the other, older parties, how they had this in their beginnings, they represented groups with something in common, and a shared perspective. They may have changed since then, maybe significantly. The LP doesn't meaningfully represent worker any more, for example. But because it's been organic there is still a kind of coherence.
I was a Green in Canada for a while - the part is in trouble now, in part because what held them together initially isn't at the center any more. Originally they were in many ways quite centrist, and seemed to pull from both right and left approaches, but in reality were basically low level communitarian which is a perspective that does actually span right and left politics. But as they have attracted more "progressive" members and tried to appeal more widely, they too have been captured by idpol and begin to look like just another version of urban socialism.
So I guess my thinking is, what ideas unite those who are now politically homeless?