Depends on the area, too.
Someone posted on here today that there were ten people at their Resistance mass today. I wasn't counting, but we probably had forty, maybe more.
And of course, there are priests all across the world. It is certain that there is a significant (though not majority) dissent towards Fellay & Co.
It also depends on what you mean by "the Resistance." If meant just generally to refer to those priests who have left or been expelled from the SSPX (as well as the faithful who have left), it's not like now that they're not affiliated with the SSPX that they just all fall into the same group by the fact.
Those who have left are unified in that they do not want to deal with heretics in Rome. But after that, more division begins. There are disagreements to organization. Should "the Resistance" be worldwide, with a superior general? Or should there be different chapters, governing themselves according to location, each with a provincial head? Or should it be entirely informal, with worldwide mass-circuits? Then of course you have the ecclesiastical differences, as there are sedevacantists, non-sedevacantists, anti-sedevacantists, etc. It seems to me that at least in the American Resistance, sedevacantist priests wouldn't be welcome to join with Fr. Pfeiffer, at least according to Fr's emphatic anti-sedevacantism. In South America, would sedeplenist priests be welcome to aid the sedevacantist priests? And then, of course, since each area is co-ordinated by laypeople (exception in Bostn, KY, I suppose) there are naturally personality conflicts since there isn't even a figurehead of authority in the group.