I suspect that the plan, in so much that there was one, was for Trump to have by now declared a coup and to rally the cops and any seditious troops together with them, rather than for capitol police to eventually kick them out and ever so slowly begin escalating to get them away from the building.

Now all their supposed allies in power have abandoned or turned on them, so in the short-term they'll probably go home defeated, but who knows how this manifests over the coming years.