The obvious and sensible option is for the system to be scraped but as its a status thing and it keeps the UK's seat on the UN security council no Westminster government will ever get rid.
As no UK government will ever get rid I would like to see the SNP push for the Trident boats to be relocated to somewhere in the home counties and replaced by the fleet subs or the surface fleet moved to the Faslane and Rosyth to counter any job losses.