Why are you all acting as if this faction at DAL is something new or surprising? There has always been a significant group of anti-union and anti-ALPA people within the Delta pilot group. This is by no means the first time that someone at DAL has proposed "leaving ALPA".
If a majority of Delta pilots were in fact interested in forming their own union, there is no doubt they have the ability to do so and can certainly survive without ALPA.
Having said that, why would they want to? The fact is that the Delta pilot group does have more clout because of their membership in ALPA. There is "strength in numbers" like it or not. Don't think that both the leaders and the group at large are unaware of that.
Apart from that there is little reason for the Delta pilots to be dissatisfied with whatever ALPA does or doesn't do - given that the Delta pilots have been running ALPA for at least the last 25 years.
Nothing and I do mean nothing, of any great significance has happened in ALPA over that time frame that did not have the approval of, or was not originated by, the Delta MEC. So, if something has happened with which they disapprove they need look no further than their own MEC. The Delta pilot group dominates ALPA and has done so for more than two decades (and that's being conservative). The Delta pilot leadership has never hesitated to wield its power to get its way within ALPA over that time frame, including openly threatening to "leave" whenever any significant opposition became apparent. They know they can survive without ALPA and the rest of ALPA knows that the "country club" can't survive in its present form without them. Call it "leverage" (that's the nice word) if you want but it's there and it has worked quite well for them. In other words, it's their ball game and it was long before the NWA merger - although they are now stronger than ever before.
In that time frame they have had only one serious challenge to their dominance, which came from UAL. They were able to overcome that by some near brilliant political manuevering and finally managed to get rid of the "fly in the ointment" that was the source of the challenge.
In short, Delta runs ALPA, period!
Now that UAL/CAL are merging their is the potential of a new challenge to the dominance of Delta within ALPA, but that is one that, IMO, the Delta group is quite capable of handling. They are quite capable of getting in bed with whomever suits their purpose to keep control.
Unless DALPA should lose control of ALPA I wouldn't worry too much about any fringe group of Delta pilots that wants to walk out of ALPA. Like I said, there have been others before.
As for the "conflict" between Regional pilots and Legacy pilots, it is mostly a rhetorical myth. The regionals do as they're told when they are told, and are literally powerless to do otherwise. They have never been smart enough to vote as a block and that is not likely to happen. So, They are "tolerated" so long as they don't make too many waves. Those that might seek to rebel find out in short order which side their bread is buttered on. They represent no serious threat to the Legacy pilots that cannot easily be dealt with inside ALPA and is. That is to be expected if you belong to an organization where you are outnumbered more than two-to-one. Call it "democracy". Remember, Democracy has no obligation to the minority; majority rules.
If Regional pilot groups don't want to be dictated to by the Legacy groups, they have the option of leaving. Not one has dared to take it. Some have declined to join, but other than that they do as they're told. That is not going to change.
Love them or hate them, the Delta pilot group is probably the most savvy within ALPA and decidedly the most politically astute. Most of them are Republicans and they vote like Republicans - in solid lock step. It's a strategy that is just as effective in ALPA as it is nationally. They can snatch political victory from the jaws of defeat when least expected. For that they are to be admired. In ALPA Delta is THE force to be reckoned with.
Why leave when you have a good thing going? It doesn't make sense.