I have a lot of hope for the chromecast. I've got two of them. That said, their limited functionality out of the box is frustrating. But, you can chromecast a TAB from chrome on any wifi device. Even tabs running amazon video or something similar. Unless it has some draconian copy protection sceme.

That said, I don't think the chromecast is ready to be my primary video viewing device yet.

It probably will get better. It probably will get better with hacking and with additional third party integration.

I'd probably go with computer upgrades, but that's just me.