How would they do that? By which I mean, "What technologies would they use to accomplish it and what would their rationale for doing so be?" It's already been

How would they do that? By which I mean, "What technologies would they use to accomplish it and what would their rationale for doing so be?" It's already been possible to 'hide source' for years on the web, either in the form of compiled swfs for Flash files or, these days runtime code or output spat from server side complexity. Without a fundamental re-write or philosophical change on the internet though, there's little to fear that 'the majority' of sites would go this route in any imaginable near to mid-term future. Conversely, anyone paranoid or arrogant enough to do so could do, shooting themselves in the foot a little, now. Your main concern should be, i'd've thought, messy and compacted code that uses a mashup of irrelevant and bloated frameworks, because that way lies bad habits and obfuscated education... HTML as is though? i'd not concern myself.