I am not at all convinced there are grounds for SF to move much further than where they are now, and there are a number of reasons for that:
1) The very hierarchical (dare I say militaristic) nature of the organization itself; centralism and discipline need not be bad things in a party, but the omertà on sex abuse and so on reflects poorly to say the least. The silence (aside from unofficial briefing of journalists) on the process leading to the expulsion and suspension of councillors in Cork County Council, and the use of terms like 'stood down' in relation to local cummain, adds to the dubious aroma.
2) The historical legacy of political violence. Most voters are old enough to remember the PIRA campaign, kids being killed in explosions etc. This has never been disowned or condemned by SF. Many people who might be sympathetic to SF's publicly avowed policies would not vote for the provos' public face.
3) The history of the party means it has grown from ultra-nationalist elements rather than community and campaigning groups, so it is hard to know exactly what its base represents (or indeed believes or wants) at this point
4) Its preparedness to leap into d'Hondt arrangements with whoever bats the eyelids at them, with a view to securing feudal chains of office for 2016 - combined with a readiness to enter more developed agreements with the hated Labour Party on the sharing out of council jobs
http://www.independent.ie/irish-new...secret-deal-on-top-council-jobs-31336634.html - makes them look as venal as the rest.
5) Even if a choice was made by (or for) Grizzly that he step down as leader, who would really believe that MLM, Doherty, or whoever replaced him, was not answerable to an unelected army council?