In the past I would have agreed with the ideas from this article here. But as a long-time SL users and with a glance to the development of many OpenSim grids, I don't want a combination of both platforms today. Technically SL is now light years ahead of OpenSim and I am completely satisfied with the development.
"Second Life land is currently significantly overpriced — comparable land on OpenSim goes for about a tenth the price, without steep setup fees."
Overpriced > yes
Comparable land > That's a good joke! If OpenSim would be comparable with Second Life, then the number of users of all OpenSim grids together would not be so insignificantly small compared to SL.
SL is where the people are!