There are indications that the SNP leadership are trying to talk down the prospects of a quick indyref2 after a Brexit vote. For instance, this is what Humza Yousaf said recently according to The Herald:
Humza Yousaf, the Scottish Government’s transport minister, has made clear that, personally, he would not like a second referendum on Scotland’s future in such circumstances, noting how it would “make the argument for independence very difficult”.
[He] then added: “I do not want a referendum in those circumstances. It makes the argument for independence very difficult as well. It presents us with some additional difficulties and some additional challenges.”
I agree with Humza that it might be difficult to win a new indyref immediately after a Brexit vote, when voters are aware that a Yes vote will mean that the English-Scottish border will become the external border of the EU. I therefore very much hope that the UK votes to Remain in the EU.
However, if Brexit happens, it'll only get harder to win a new indyref if we wait a few years, so unless we want to kick Scottish independence into the long grass, we'll need to act immediately afterwards and hold a new referendum in late 2016 or early 2017, well before the (r)UK leaves the EU in the summer of 2018.
The reason for the urgency is that Scotland's big chance is to vote to remain in the EU without ever leaving the bloc. If that happens, many companies will choose to relocate here from the rUK. On the other hand, if Scotland leaves the EU together with the rest of the UK, those companies will move to Ireland or another EU member state, and they won't move to Scotland even if we decide to become independent a few years later. Even if just 5% of the companies currently domiciled in the rUK move to Scotland, it will be a huge boost to the Scottish economy and will lubricate the change from dependence to independence nicely.
It's also likely many people in the EU will suddenly encourage Scottish membership of the EU so that not all of the UK is lost after Brexit. For instance, in a role-play organised by Open Europe, the "Netherlands predicted an effort to channel investment to Scotland, in an effort to peel it off from the rest of the UK."
Furthermore, YouGov's Peter Kellner has pointed out that there normally is a late swing towards the status quo in referendums, which is exactly what we saw in the 2014 independence referendum. However, just after Brexit, there won't be a status quo -- the alternatives will be to remain either in the EU or in the UK, but not both -- and this might prevent this late swing from happening again. On the other hand, if we sit on our hands for ten years, a status quo will have re-established itself, which will benefit the pro-UK side.
In other words, a snap indyref2 will appeal to both risk-takers who believe Scotland can poach a lot of English companies as well as to the natural conservatives who are worried about what will happen if we leave the EU. Combined with those who are already convinced about Scottish independence, that might well be a winning combination.
Things won't get easier over time. So long as England remains outside the EU, a vote for Scottish independence will be much more daunting than it was in 2014 when it was simply a question of turning the English-Scottish border into an internal EU one.
So yes, I'm pessimistic that we can win indyref2 after a Brexit vote, but our only chance of doing so is to have it almost immediately afterwards so that Scotland never leaves the EU and can become the natural new location for companies wanting to remain within both the EU and the old UK. After that, any hope of independence will be kicked at least twenty years into the future.
Of course I'd prefer the UK to remain within the EU, but given recent opinion polls, we have to be prepare to seize the moment after a vote to Leave.