Easier would be if they created an online form or possibly a meatspace dropbox (to realistically prevent DDOSes) which auto-issues you a license to use their patents at zero monetary cost or cost of postage.
Imo there will be :
* Other car manufacturers (such as BMW, that already contacted Tesla on this matter : http://www.theverge.com/2014/6/12/5804890/bmw-confirms-that-...
* Oil stations (Esso, BP ,etc.). Electricity based car ARE the future. This is their chance to become a part of it.