You're saying Google is enforcing whatever it wishes upon others. Aka, non-standard stuff.
The Pepper API would be all nice if it wasn't hiding the NaCl vessel. NaCl is a very hard to standardize (yes, being open source has nothing to do with ease of implementation, or proper standards. News at 11.).
NaCl is also (one of) the vessel for Google to get more control over the web, due to the above, and that it can do stuff such as "take your C/C#/etc. app and run in it Chrome, via Chrome market!", while they know others can hardly ever implement it.
you can be relatively sure that Google pushed Adobe a little bit in that direction, and that eventually flash may be Pepper API only. Its easier for Adobe too.
The Native Client source code repository is huge, but it is not that hard to find your way around in. I have been studying it because I plan to build something on top of it. I am by no means a stellar programmer, and I have found it reasonably navigable. (It did take me a few days to get my bearings, though, and I plan to use a much simpler, custom API to minimize the application's attack surface. Haven't looked much at Pepper.)
yes - but
implement it in opera, ie, or firefox - you'll find that you've to rearchitecture a lot of your browser - or might as well just grab webkit (of course, in our case you can just try firefox since its the only open source one of the 3)