You have to distinguish between 'boycotts' and simply walking away because youve had enough. A boycott is a protest from people who still care. Walking away is what people who no longer care do.
I dont think there will be any concerted boycott by significant numbers of fans of one club, against another club, apart from possibly a section of the Celtic support against Kilmarnock. If Rangers, after all they have been exposed as doing in the last 15 years, get a lifeline because of who they are, a lifeline that no other club has ever had, then lots of fans of clubs across the country will simply walk away. Thats not a boycott, thats a loss of interest and a loss of customer base which, in all likely-hood, would take a generation to recover from, if ever.
What the SFL clubs have to consider his week is the same as the the SPL clubs had to consider two weeks ago and its two simple questions.
1. What do we really believe ALL the consequences, benefits and drawbacks are to our club of admitting Newco to the 1st Division.
2. What do we really believe ALL the consequences, benefits and drawbacks are to our club of NOT admitting Newco to the 1st Division.
If a club with its own interests at heart believes they can survive without Newco in the 1st Division, they should vote NO
if a club with its own interests at heart believes they will go under without Newco in the 1st Division they should vote YES
If a club in the SFL seriously thinks they should cast a vote, contrary to their own interests AND contrary to their fans wishes but for the greater good of Scottish football in the eyes of that club, then they have to be prepared and willing to accept whatever backlash comes from their own fans.