I think there is among unattached marxists and other socialist revolutionaries in the U.S. and elsewhere widespread agreement on this - though "this" is frustratingly vague. The party-organizations of both the 2d & 3d internationals are dead so deat that criticism of those organizational forms tends to be bullshit antiquarianism, often grounded in a silly conception of hwo we "learn lessons from history." Diatribes against Stalin, for example, are utterly worthless as barricades to whatever new forms of revolutionary error await us.
It may be of some interest that the prevailing opinion with in LRS during its last years was that there would be no single-party hegemony in any u.s. revolutionary struggle - but beyond that they were as vague as anyone on this list of what actual shape such a multi-party 'leadership' would take. I'm not even sure the issue can be usefully discussed prior to the rise of more active mass movements in the u.s.
Carrol