Probably the best and the worst thing about working on the internet is that you can’t ever be ‘really sure’ whether what you are doing is going to work or not. Couple of years ago Flash was considered more or less a dead bet for everything on the internet. Now it does everything from entire websites to streaming.
It would be anybody’s guess as to which technology will suddenly shape up and make itself more useful on the internet, after being written off for all practical purposes. I guess Java could be one ideal candidate, with the nifty and underused Webstart concept. It could even be the Mozilla platform and XUL.