I think the main selling point seems to be the low capital cost.
I too think it will struggle to make a business case, especially as the Brigg - Barton omnibus service has recently been withdrawn. That said, I don't think we should stand in the way of the scheme, it is an opportunity to sell the benefits of a service on the north end of the Barton Line and it would be good to see a proper railway service provided to Brigg and Kirton Lindsey once again. Perhaps the feasibility study will consider other ways in which these aims can be acheived.
I agree about the optimism of some of these schemes. Melton Mowbray - Nottingham would require the relocation of a test track. Consett I believe has had much land built on. Bury - Bolton is strange but I could see it being well used if a decent service was provided.
On the other hand, Fawley and many of the new stations and infrastructure enhancements I think stand a very good chance.