There are so many choices - Multimate, Wordstar, Word Perfect, Pagemaker, dBase II, Symphony, Lotus, Excel, DOS, CPM, and on and on and on.
Clearly the economics of virtual worlds will sort things out; but, do think about this. The Internet is the underbelly of the virtual world, wheareas it wasn't in the days before TCP/IP and HTML. So, if we're going to reduce down to one platform, one solution seems highly unlikely. I know we all use Office, and we think it's the end-all and be-all; but, there is no real text in nature, there are no spreadsheets. There are 3D visual objects that are mostly biological and chemical in nature.
The virtual world extravaganza, the journey into innovation, and multiple neurons and visualizations should be very exciting to the developers and users of virtual worlds. Pick one, say Second Life or Forterra. And build like a madman so you really understand the affordances, the business processes, the communication techniques. And prepare yourself for our next transformation in computing. Trust me, when the supercomputers arrive at your desktop, you want to make sure you know more than C:>