I can give you a 10 pages proposal written in ancient chinese + arabic, and tell you this one can solve all the problems for bitcoin, would you accept my proposal? You need to first go into some university for 10 years before you understand what I'm talking about, or you simply ignore it?
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In other words, you are saying that you lack experience/knowledge in the field. This does not make the proposal that complex. There are simpler solutions, however this one is not as complex as people are saying that it is.
It is not about expertise here, it is about time. Given two developers commanding same level of skill, A write a code and B want to make sure it is bug free and secure, the time it takes for B to validate the code will be much longer than the time that A spent on writing codes. Of course you can validate all the security holes of SW given enough time, but that will be months/years and we have not seen the code yet
You can make a poll to see how many people understand BIP101 and how many people understand SW
Actually I don't understand why Gavin showed so much positive attitude for SW and even push it as a hard fork, maybe because he knows it will fail, then people will run into his XT as he planned