I don't think its question of whether Scotland will 'manage' or not. It has enough resources and products to export etc.
If Scotland wants independence, go for it. I'm fed up of the half way house which is semi devolution resulting in two parliaments with all the extra bureaucracy that hasn't translated into better outcomes for actual citizens. Same for Wales and NI. And England left with no own parliament of its own.
Fed up of seeing Scottish MPs waste questioning time of the PM on independence rather than critical issues for Scotland and the wider country. We will never move on to sorting actual issues whilst political parties are fixated on their end goal. It clouds all other topics.
We'd be best to shake up the whole governance of the UK.
UK parliament supreme for certain matters like defence but doesn't need 650 MPs nor to meet so often. Which will save a tonne of money by not duplicating parliaments on the same matters.
Full devolution to the four nations, MPs meet in local parliaments instead. In fact, they can just hold them virtually. Taxation powers, transport, all council services, education, health. Regional areas set tax and keep the proceeds. Scrap councils as all their services should come under control of the regional parliaments which also saves money.
Some part of the country will more expensive to live in than others from a tax perspective. We can then judge which areas offer good value for money and move accordingly to what suits our own politics.
Initiatives like baby boxes for every household will have to collect the revenue from their nation to fund it. Gives voters much more say on whether that is acceptable or not. Allows Scotland to become the high tax, high spend state, and other nations to decide whether more diversity co-coordinators and cycle pathway improvements officers and other layers of non jobs and bureaucracy are really needed. Or whether we can have a smaller state and more money in our own back pocket to spend. Oh and we should have much more power to kick out useless MPs, ones that change parties with out going back to voters for re election and those that break the law.