For me it would be a complicated yes, no, and then yes again possibly.
Yes - Definitely taking the 50% off for the first year. I'd actually consider this paying back for the 5+ years I've enjoyed C2 and its updates as a hobbyist. Any other software would have gone through multiple full price iterations in the same time period *coughphotoshopcough* with similar progress in terms of functionality. Also a significant factor is how Scirra has handled community and communication - I would be inclined to pay to support their continued operation even as a donation. The overall responsiveness is #1 by far compared to any other developer, and I've worked with a LOT of under development (and developed) software. Besides which $100/year is honestly cheap compared to other expenses (for someone with a job anyways). It is still cheap compared to other productivity software. Would I have preferred a one off payment? Of course, more value for me. But I wouldn't go anywhere near saying the subscription pricing isn't fair.
No - There is nothing I am doing now that would require anything beyond what I have in C2 or C3 free. I'm not actively working on any big projects or publishing regularly, nor do I rely on any income from my projects. Currently I'm getting most of my use of Construct just lurking on the How Do I forums and making small examples, which should be adequately facilitated by C3 free/C2. I also test out specific mechanics I want to experiment with or small utility projects, but again everything can be done by what I have without subscribing.
Yes again possibly - When C3 gets a new runtime, I'd definitely be interested in checking it out. On the other hand, I imagine the new runtime would be available to C3 free as well, so the same as above applies for my situation anyway. At least it would be a definitive reason to upgrade from C2 to C3 for lot of other general users I think. The last situation would be where I have a income generating project I can devote myself to that could justify a subscription, but at that point C3 would be paying for itself.
I find it a bit confusing why people are so miffed regarding the subscription and perceived lack of significant capability changes from C2 to C3. Scirra isn't taking your C2 license away - you can keep using it. They aren't forcing you to subscribe to C3 if you can't afford it. Also regarding lack of change... did the mobile app build service just fly under the radar? Isn't that what tons of people have been clamoring for? All the complaining just makes me feel like this community is basically spoiled by the value gotten from C2 rather than appreciative.
Edit: Aaand he's gone. A little sad because he did make contributions to the forums, but then again not at all because he was totally asking for a ban. I guess he can still read the replies?