Well, speaking as somebody who has most of the Horizon series, a couple of Vienna Instruments and bought Pro Edition Strings only a few months ago, I'd like to say a few more things.
Firstly, some of us out here actually don't like the Vienna Instruments interface, and still find serious benefits in running EXS versions in Logic for example- people work in many different ways with this library. I have my own very efficient methods which I much prefer to keyswitching etc. This whole expansion of the library, wonderful as it is, is really totally impractical for many of us professional composers as the hardware to access such massive files is still way behind, and that makes using them time consuming. I simply don't want all the extra articulations right now, until I can buy an off the shelf PC/Mac with 32gig of RAM etc. That doesn't mean I want my upgrade path taken away though! And whilst I understand it can't last forever, some of these products are STILL BEING SOLD - see timespace.com. This July cutoff is seriously too soon.
Secondly, as regards the trust issue, I'm not sure now if I've at least made a smart move in so far as, at least a bunch of wavs of your HD cannot be taken away from you. Any VI on the other hand can eventually become totally useless should you not keep legacy OS's or hosts running. VSL's behaviour on this matter means I trust them significantly less to support Vienna Instruments now too. For me, that means that like any investment, I'll probably spread it more now towards the other libraries such as East West, who also provide great products.