Normally just asking the same question until you get the one you want would be a bad thing. Having a question after a generation of sustained support would be fine. It doesn't look like there's any sustained support from polling even with the Westminster shambles, but the SNP keep doing well in the elections.
However there have been material changes since 2014. In 2014 a key point was there was no guarantee that Scotland would be admitted into the EU after "scoxit", and if they didn't it would cause chaos. The UK (specifically the majority of people in England and Wales who bothered to vote, which outweighed NI and Scotland's majorities against chaos) voted for that chaos anyway.
I worry that there wouldn't be a detailed plan though, same problem as brexit. What will independence actually mean. If you were born in Scotland but live in Carlisle, do you get a Scottish passport? What if you own a second house in Scotland? Or would it be your income tax residence, if so on what date? What will border controls look like for people (both practical day to day, and things like living or working cross border). What about goods and services. Will Scotland's use a currency guaranteed by the Bank of England like some countries use the US dollar, or will they create their own Scottish Pound. Then of course that's all the arguments about the maritime border, allocating the UK's existing assets and debt, what happens with the military (will Scotland have an independent army, will it join NATO, will it contribute to rUK's defence, what about existing military bases), head of State (does Scotland keep the Queen [King]), etc.
I think that having a first vote, two options
* Scotland should form a detailed plan by Dec 31st 2027 to be put to a yes/no referendum before June 1st 2028
* Scotland should maintain the status quo and not have any further independence referendum before Jan 1st 2040
Which would be enabled by legislation to ensure that the rest of the UK fully cooperates with that plan, and authorizing Scotland to attempt to talk to international groups (EU, UN, NATO etc) about transition
That would then be followed a detailed plan which answers those questions (and more), and then a "are you sure" vote, would be sensible.
Do you support the Scottish independence plan
> Yes, Scotland should become an independent country on Jan 1st 2029 following the detailed independence plan
> No, Scotland should maintain the status quo until at least Jan 1st 2040
My browser asks me to confirm when I try to quit, having an "are you sure" question for major constitutional change makes sense.
I personally think it's actually a worse idea now than it was in 2014 because of brexit -- we'd end up with the NI chaos but with a land border rather than the sea border. If we were part of a wider economic union then it would be fine, but that means Scotland giving up their say in the rules but still having to follow them, just like the UK and EU. In 2014 if Scotland were admitted into the EU it would have been fine, probably a good move.
However my views are worth about as much as my views on Italian elections. It's entirely upto the people of Scotland, and I don't live in Scotland. My brother in law might be affected, he lives in North Cumbria as a builder, sometimes he works in Cumbria, sometimes Northumberland, sometimes in Dumfries, but that's self determination for you, and I always support self determination, be it for Falklands or Puerto Rico, Catalonia or Northern Ireland, Gibraltar or Crimea, Ukraine or Puerto Rico.