While there's still time, it's to your benefit to try out the new templates, observe what you do not like about them - and what you absolutely cannot live with, and objectively report your issues in Blogger Help Forum: Layouts & Templates.
If you have issues, your issues are shared by other blog owners like you, and all concerned can report their issues, you'll have a better chance of having your concerns heard by Blogger. In effect, you can help to drive the final migration, from HTML to XML based templates - if you get involved while there is still time to do that.
If you wait until the last minute, when Blogger gives you the "last call" notice
FTP publishing is no longer available as of May 1, 2010it may be too late, when you find out details that absolutely don't work, for you.
You currently have blogs that are published using FTP. You must migrate your blogs to a new custom domain URL or a blogspot URL. To learn more, see our dedicated blog and help documentation.
Move ahead, now - or be stuck, later
I guess it's time to move to WordPress, as Blogger isn't listening!!