Business Justification for On Prem SharePoint 2013

Hi community

I am assisting an organisation with developing new small to medium sized Intranet. They previously purchased a number of single SharePoint 2010 server volume licenses and nn  x (SharePoint 2010 standard CALs+ SharePoint 2010 Enterprise CALs ).  Having suggested that it would be prudent to upgrade to SharePoint 2013 given my understanding of their requirements ( and vision statement).  I am now tasked with writing a brief document outlining the business justification when compared to remaining with 2010 now, and incurring the pain in a future upgrade.

I wonder if anyone has any thoughts on the following when considering the cost/effort verses the rewards to the business: 

• The likely date for the next version of SharePoint ( with possible Yammer and Exchange integration 😉 ) as being several versions behind will be an issue with this organisation
• Development effort required when targeting various mobile devices i.e. the pain if I don’t have the new wizzy features: mobile contemporary views, device channels, image rendition, minimal download strategy etc. 
• The new social features such as the new community site & blog sites, recommendations, gamification aspects, or even the Yammer App integration as I think will encourage real engagement with the intranet.
• Content roll up:  now without the new cross site publishing and the new CSWP; rolling up content from different site collections ( or Farms) , could involve web services , custom code or 3rd party web parts such as the fantastic product from Lighting Tools. 
• Search – I think video, and conversation search will be of particular interest. 
• The increase in server costs – extra memory needed for A/S plus Office Web Apps and Workflow may also be situated on other servers 

Note,  I will also show some example Office 365 plans to see what costs/benefits are for going cloud or hybrid.

Regards

Daniel