Thats the thing tho, nothing will happen as regards to the cutting of a single player offline mode, when backing the game every person effectively becomes an investor (much like dragons den for a popular tv reference) and not a consumer, the final product did not exist and folks were merely backing the plan for a final product, single player offline mode has been deemed an un-achievable goal by the team working on the plan, as an investor your choices are to either A) shut up and put up or B) withdraw your support and ask for a refund, there is no option C for silly stuff like law suits etc.
Stop talking sense dammit this is a thread for people to thrash and moan and vent, and come up with all sorts of outlandish conspiracy theories, delve into continental consumer laws and be amateur lawyers instead of accepting business decisions and getting a refund. Leave them to it.