I strongly hope that there will be a drive among the major browser makers to do what it takes to make the future Web as powerful a platform as possible, even at the expense of delegating support for some old websites to legacy-support plug-ins. I personally would not have a problem with a dual-path approach to the Web: one set of browsers that specify a "current standards" Web platform with maximum capabilities, strict rules, and no legacy baggage, and an optional set of browser plug-ins, to which older, non-conforming sites are delegated.
This would allow the Web platform on small-capacity devices such as watches or headsets to grow in capability like an iOS device with its frequent OS upgrades and deprecation of older code, but would make the whole Web back to the earliest websites still accessible to somewhat larger and more capable devices (desktops, laptops) that could afford to include plug-ins for any old crazy code from the past.
I really don't want the Web to be the "we'll keep hanging on to the past" platform, while the native APIs are the "we'll keep bringing you the future" platforms.
This would allow the Web platform on small-capacity devices such as watches or headsets to grow in capability like an iOS device with its frequent OS upgrades and deprecation of older code, but would make the whole Web back to the earliest websites still accessible to somewhat larger and more capable devices (desktops, laptops) that could afford to include plug-ins for any old crazy code from the past.
I really don't want the Web to be the "we'll keep hanging on to the past" platform, while the native APIs are the "we'll keep bringing you the future" platforms.