I'm not nearly as confident as you seem to be.
People with purchasing power can still be swayed by FUD. Less-technical bosses are not-infrequently swayed by marketing copy from glossy mags and giveaways from salesman rather than sound technical advice from technical staff. It's abundantly clear that shadowy back-room deals and front-room exclusionary deals based on tremendous price cuts on widgets that have a near-zero unit cost are still tremendously effective.
I expect that within five or ten years, after this new crop of programmers have happily been making Microsoft software a critical part of their workflow, Microsoft will return to its traditional MO.
As I said earlier, for many of us this isn't our first rodeo, and isn't the first time Microsoft has played the nice guy for a little while. :)
Three things:
1) That describes a corporate goal, not a set of behaviors used to achieve it. There are many companies out there who also have the goal of "Keep everyone using our software.". Not many of them have utilized such destructive techniques as Microsoft has in pursuit of that goal.
2) Your second sentence would be more correctly spelt "Microsoft's game plan is to keep everyone using Microsoft software, wherever possible.". When you spell it that way, it becomes clear that the big picture actually hasn't changed. Windows was (and remains) a big part of that game plan, but for the past decade or two, it would be hard for an honest observer to make the claim that Microsoft was only interested in keeping folks on Windows.
3) Many of us have seen Microsoft play nice with the wider community. They never play nice for very long. The more cynical old-timers would say that this "play nice" phase is -itself- a part of the EEE strategy.