Discontinuation of support for Session Border Controllers in Exchange Online Unified Messaging

This is still a huge issue for us, as it is the primary reason we can't currently deploy our Exchange Online subscription. This announcement was made 2 days after we made a multi-year commitment to SPE E3, predicated on the nature of our SBC design working. 

Now we're back at square one (only we're paying for it, dramatically).  Considering all the user feedback, is Microsoft considering a further reprieve or what other options might exist that would allow customers to still use Microsoft services for Exchange Online/Unified Messaging even if we aren't on the Microsoft Cloud PBX?