Not that better technology will alone push users over to Google+, of course.
Social Networking Showdown- 8 Facebook Features Google+ Doesn’t Have (Yet) – Slideshow from PCMa
Community and approach (your actual friends instead of faceless people) was what made Facebook popular.
Obviously Google+ needs to support apps too.
The biggest hurdle for Google+ is that no one’s on Google+. Catch 22.
Google needs to pre-invite Gmail users and pre-link to Blogger blogs etc to increase the likelihood of making this a hit.