It is quite likely that this will happen eventually, but it is unlikely to happen soon. You have years before you will need to worry about it.
All four services are written in Java, which is (supposed to be) OS agnostic. But they are written and supported by different teams. Bitbucket is very different from the other three because most of the data it works with is file system based, rather than held in a data store (Atlassian uses databases as a data store, not a database), and that presents some different challenges than a data store does.
From what I've heard from Atlassian developers, (so this is anecdotal), the main problem is that Windows doesn't support file systems that work well with large git repositories, so they don't want to have to field support calls that go back to "well, you'll need to get Microsoft to fix that", because MS are not going to.
So Bitbucket is a bit different from the others. The others do not have external dependencies, so Atlassian have no reason to stop support for them on Windows - as long as the OS runs Java, provides a basic file system for attachments and does the networking that allows for people to contact the service and for it to talk to the database, then it's not a problem to support the software when run on it.
From what I've heard, support for Jira, Confluence, Bamboo, Crowd etc on Windows is not going away until the user base shrinks to a point where there's no point in supporting it. There is skew in the Atlassian market - most places running Atlassian stuff do it on Unix-like systems because they're simply better at running Java based stuff.
Atlassian are not going to drop support for the other systems running on Windows any time soon. If they do, they will announce it with plenty of time for you to plan and execute a move (and because the architecture of the non-bitbucket systems is application + database + simple file store, your migration plans will not be complex)
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