Unless you have a crystal ball, I don't know how you can predict that.
As Andrew said, these comments have been made for years and nothing has changed.
The way things are going, it's just as likely that Scotland will be independent and the relationship between ITV and STV diminishes.
I'd say that with the way UTV has gone/is going, STV can't be far behind. I highly doubt, even with a second Scottish referendum and political influence, Scotland will go independent. Nor do I think viewers would ultimately care too much these days if it was absorbed into ITV. In fact, with the little regional programming it provides, plus the opt-outs of popular ITV shows, Scottish viewers would much rather watch ITV
I don't really want to hijack the thread for UTV, however, your post is full of baseless assumptions and political ignorance with regards to Scotland.
Even if the prospect of another independence referendum is taken out of the equation, the political landscape in Scotland has changed immensely over the last two years or so.
The Scottish Government are continually pushing the U.K. government for more and more powers for the Scottish Parliament, and broadcasting is one that continually comes up time and again. The long game is being played with regards control of broadcasting and the effects of this being transferred to the SP is one uncertainty.
Another uncertainty is where Scotland will be in 5 years time. If it does becomes independent, what will this mean for the Channel 3 licence? The SNP did agree that all broadcast licence agreements would be honoured in 2014 until renewal, but time has moved on, and will this be honoured in the event of another referendum? I would hazard a firm guess that the Scottish Government would not allow a London based broadcaster on a PSB service for Scotland after renewal at the very least.
Another point is regards the broadcast sector in Scotland as it stands today. The BBC in Scotland is under tremendous pressure to up its game as it is seen as lacking in reflecting Scotland and its people today. This is pressure from the SG; its audience, and its competitors. The "Scottish Six" is back on the agenda some 17 years since it was first mooted, and after some bureaucratic dithering from the BBC, STV have stolen the BBC's thunder and announced a "Scottish Seven" on a relaunched STV 2 next year. The market in Scotland is different to the market in England, Wales and NI.
NI and Scotland are completely different. NI does not have the same political pressure on its broadcasters and UTV has scaled back its TV output over the last decade; STV has been increasing its output in competition to the BBC and others. It may not all be to everyone's taste, but they have increased homegrown productions nonetheless. NI also does not have the same constitutional issues as Scotland, which would without a doubt be a risk for any takeover.
You say that Scotland becoming independent is unlikely. How have you come to this conclusion? Personally, I know many 2014 no voters who are now pining for another referendum as they wish to remain in the EU. Again, the long game is being played to call another referendum, but I am sure it is only a matter of when and not if.
The sale of UTV to ITV was not hostile, it was due to UTV making a poor decision in the launch of UTV Ireland and making big losses which it could not afford to plug. I assume ITV is more than happy to continue to affiliate arrangement and is happy with the income it receives.