Basically running in Exchange in house will become prohibitively expensive for small businesses after SBS 2011. This is Microsoft's incentive to get all SMB users on Office 365/Exchange Online.
I've been having words with a few MS Executives and it seems like that have no interest in bringing back the SBS Package or any sort of reduced pricing for small business. However, I will keep trying. Some of the top IT Gurus/Partners are lobbying for the same reduced pricing for SMB. Might be a few years until we get through to them. Many partners are threatening to go with third party solutions for roughly the same price as SBS 2011.