"What about libflashplayer.so ? " ?
That's just the binary the provides the Flash Player. I assume you mean the illegally distributed (but genuine), buggy and unoptimised one that provides a Flash Player version 10 ? What do you think I think of it :-)
"right now then probably we never gonna able to flash our videos ? "
Never is a long time. But near-to-medium term I wouldn't expect an updated Player. If and when MeeGo get's out in the wild, we'll see what Adobe have or have not been cooking for that platform, which in theory should run on an N900... that's at least a year away though, I'd say. Not withstanding Nokia's intent to produce one MeeGo phone this year, it'll need a lot of work to run on a stock N900. Alternatively, you could run Android on your N900, if you can do without phone calls. So, again, wait many months.
If Flash v10 is that big a deal for you, go get a modern Android device.