16:9 720p just isn't enough horizontal screen real estate. with 1080p I can have two documents fit besides each other which would greatly increase my productivity when working on a laptop.
And a larger resolution doesn't mean webpages are going to put more stress on a network, you're still designing the webpages for the lowest common denominator (most web pages don't even use all the horizontal in a 16:9 720p monitor). Hell I'd be annoyed if they decided to make everything wider since I'd have to continue to have one web page taking up my entire god damn screen.
And even if you did proportionally make them wider I doubt the jump from 720p to 1080p (or even to 1800p) would really require you to use vectors instead of bitmap images, it's a pretty small jump. Hell, websites don't even use as many images as they do these days, it's all clean block colours and text.
The difference is going to be absolutely minuscule. Streaming 1080p is now a normal thing, making images twice as large is not an issue :P
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