I think it sounds like a really good idea. It allows everyone to use it no matter their situation.
Although i hope if someone paid �40 for the two years they pay to keep the software without any nag screens past the 2 years but just no updates?
Also i like the idea of it being a subscription over that period, i think 2 years is a good time frame as you could buy it year one, halfway through construct 3 could come out and you then have access to that.
Still....Linux GUI would be worth paying for...HINT.