Maps will be available

After Google shuts down iGoogle, if you currently have iGoogle as your home page, Google likely will redirect you to a different page. However, I'm not sure whether anyone knows right now where you will land.

Whatever it turns out to be, you can choose a different home page at any time, and there should always be a link to Google's popular services including Google Maps. You could try it now starting from https://www.google.com/ and see whether you can still find everything you want to use.

If you have problems finding a link to classic maps instead of the new maps, you probably won't be alone. Google has a support forum for Maps that you could search and/or post on. That's over here:

https://productforums.google.com/forum/#!forum/maps