Re: If they say yes...
They tried a similar move in Ireland years ago offering tax incentives, one off subsidies and all sorts and it worked well for a while. The reality is though that at some point those tax levels need to normalise and that is largely going to depend the the cost of running Scotland v's the amount of other government revenue streams.
In Ireland, once the tax breaks broke, so did a lot of the industrial and corporate investment.
This isn't a case of fear, fear, fear. There are a huge number of factors to take into account over and above "We're Scottish and we currently hate the English". Banking, currency, investments, corporations, services, funding; all these things will be effected. Telco is just one, what about water, gas and electricity. The cost to businesses will be huge if they operate and/or provide services on both sides of the border and it is my opinion that any costs related to resolving their operating and regulatory requirements one BOTH sides of the border should be born by Scotland alone.
Equally dissolving the Union isn't just a case of applying a bit of tipex over Scotland's entry. By dissolving the union we will be effectively creating not one new country but two. There will be the new Scotland and the the New United Kingdom of England, Wales and Northern Ireland neither of which will technically be members of the EU. Will the UK therefore lose its position as a founding member and the veto rights that we currently hold. Will Scotland even qualify to join? Will they be a contributor or a beneficiary? I for one would not want them to be a beneficiary as they would be in a situation of their own choosing.
Would the UK even choose to rejoin the EU. Maybe a no vote should prompt us to get around to the whole EU referendum we have been talking about for so long.
Equally, also worth bearing in mind that just because the vote may be in favour of leaving the Union that doesn't mean it will happen.
Anyway, that's my two cents