For me, it's not that I'm afraid of GMail removing IMAP, it's that Gmail IMAP works really, really bad. For an email-client to work well with Gmail, it has to be tailored to Gmail, and that has given me some issues lately. For instance, most of my mail is sorted into labels, skipping the inbox. When using a mail client with IMAP, these labels shows as folders. Deleting the mail from my client, doesn't delete it from…
I agree that IMAP will probably stick around in some form. My big concern is if they start doing some kind of rate limiting, it could make it very difficult to get all your email out. However, along these lines the removal of Jabber support from Gmail is a little bit scary (first they removed federation support, then they killed it altogether). Limiting or removing IMAP is not outside the realm of possibilities.
> However, along these lines the removal of Jabber support
> from Gmail is a little bit scary (first they removed
> federation support, then they killed it altogether)
Federation support was temporarily disabled, then re-enabled once they got spam filtering in place. Currently, XMPP works perfectly with a Gmail account.