If they limit the use of the Keyword Tool to advertisers, all you would have to do is open an AdWords account, which costs $5 and you can easily get $100 in credit using a voucher. That is cheap for the use of the Keyword Tool. They have been providing more information to advertisers who are logged into their accounts for quite a while, so they could easily cut off access to non-advertisers. If you do not have a credit card or cannot open an account, you may be hosed.
If they eliminated the Keyword Tool entirely, that would be a serious problem because many of the keyword analysis tools use Google data. Plus I have never trusted WordTracker data due to the nature of their sources.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin