Its interesting to see people I know who were ardent unionists in the last referendum now start to reconsider their opinion; its anecdotal but most of my pals who were no supporters seem to be now a little supportive of independence; including my Mum who's not exactly a traditional independence supporter. People misunderstood how much small-c conservatism was a factor rather than principled opposition to independence, and now that the status quo doesn't really exist anymore that's causing lots of people to think again
The other question has to do with how another vote would be possible. With the SNP short of a majority in the Scottish Parliament, who do they rely on to force a vote? Is it the Scottish Greens that give them the votes to send it the people?
They're still a few seats short of a majority even with the Greens (there was a bit of a story on the Greens's policy on a second referendum before the May election; I think this chucks that out of the window), but I assume that the opposition parties wouldn't stand in the way if there was public demand for it which currently there is. Besides I'm pretty sure the Lib Dems and Labour are both reconsidering their opposition to a second referendum at this point; and there might be more supporters of independence in both parties now.
The news that Scotland would have to apply for membership isn't exactly that shocking, the big barrier last time was Spain; and I'd argue that the conditions have changed enough to make everyone reconsider things.