With regard to the possibility of either moving to a new ground or redeveloping other parts of Sincil Bank I think the following extract from the Supporting Planning Statement is relevant (emphasis added by me):
'...the Applicant has decided that redeveloping the current stadium represents the best option to meet demands in the short term. In the longer term, plans to relocate or undertake substantial development at the current Site have yet to be finalised. Specifically, redevelopment will be focused upon the stadium’s north stand, The Stacey-West Stand.'