I wouldn't worry about support if I were you.
If there's anything that DSI/Sequential have proven over time is that generally speaking support for all their products is excellent - it's one of the reasons I'm such a fan of theirs tbh.
It's VERY important to have trust in a company when you make a major purchase (lets face it DSI synths aren't cheap), and compared to a company like Roland for example who just abandon flagship products like the Jupiter 80 and Integra 7, DSI/Sequential are in a different league in that regard offering bug fixes and even adding features with firmware updates years after products have initially been released - class!
They did this with the Prophet 12 too, so I'm sure they wouldn't undo all that by abandoning support and am confident they
[size=78%] will be able to make repairs and replacements for those who might need them for a few years to come.[/size]Discontinuing a product often means a new product is in the pipeline, so don't be surprised to see a new synth from them soon.
If they gave us a true hybrid 4 oscillator synth with two analogue oscillators from the REV2 and 2 DSP oscillators from the P12 with 6 LFOs and the same UI as the P12 I'd be chomping at the bit to get it - especially if they give it a proper keyboard action this time (only thing I'd change about the P12).
Hope springs eternal.