OK, I have been quietly reading this thread and I have a few thoughts.
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The deal is barely a day or two old and, as is the case in our 24 hour news cycle world, there is mostly speculation and few facts flying around. So, I think we all need to let this play out and see. From the “facts” that have been officially stated both in releases and by @Ben and others, it sounds like ST is truly in a different class than other Samsung acquisitions. So, I think a wait and see attitude is a good idea.
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If you feel that you can’t wait or you don’t think it is going to go well, there are other options out there to switch to, such as Revolv and some other kickstarters. Yes, some people have invested a lot of time into their ST setup. But, outside of that time you have only invested $99 for the hub. Everything else you have added to the system will work on other systems. I think if the hub itself was several thousand dollars, people would have good reason to be concerned. But, at $99, you can easily move to something else like Revolv if you are nervous. And, even that is not so expensive that you have wasted a lot of money. Again, we all just need to take a step back and get some perspective.
@esung made some comments about differentiation that got me thinking. Let’s look at the land grab that the HA space has become. We are seeing consolidation and big players make their way into the space - Google, Apple, Samsung, and even Microsoft with their INSTEON “agreement” (or whatever that was). We are now entering the massive marketing and differentiation phase. Some from that group may go more proprietary. However, I think the smart ones will remain as open as possible and differentiate themselves on functionality, easy of use, and a few proprietary “Wow Factors” like maybe voice control with boxes around the house, etc.
Take a step back and look at the current HA environment. There are several competing standards, all of which are still doing well. I have a feeling that the different standards will remain, with some new ones added as well. This space is too big for there to be one or two standards. Being an IT Director, I’m surrounded by different, competing standards that are flourishing. It is normal and competition is good.
So, in the end, I’m not worried. I have a bunch of zwave switches, some zwave and zigbee motion sensors, a few other things (love my minimote)…and an ST hub. If I don’t like where ST is going, I can easily switch to another platform. Yep, I would have to redo everything. But, how is that really different than buying a new computer and redoing everything there? Yep, you have to move all your songs (switches) and photos (sensors), but they easily transfer over and you can now use them in new ways.
Yes, it is a lot of fun to speculate on this. Hell, even I have ideas what I think might happen over the longer term (mostly because Samsung has problems sitting back and letting things play out :)).
But, in the end, I know I’ll always have several options to choose from and I’m not worried…and neither should everyone else. If anything, we should all show Samsung, by doing what we do here, that the environment ST has setup is unique and worth so much that it should be left to thrive…with the occasional shot of Miracle-Gro. 
(To be honest, it is that potential shot of Miracle-Gro from Samsung that has me the most excited!)