Yes, the Ubuntu .iso files will move to http://old-releases.ubuntu.com/releases/
once Ubuntu 10.10 reaches end of life (schedule here https://wiki.ubuntu.com/Releases
). End of life does mean the repositories will be removed (as you can see here, only repositories for not-end of life releases are there http://packages.ubuntu.com/
However, with the repository's total size being estimated at about 100 GiB total size, you could mirror the repository now (before April) yourself. Just for yourself, or if you want also for others (get ready for a letter from your ISP in that case
). You can use apt-mirror for this. It is not uncommon to use. If you have multiple computers in your home or place of work, having just one computer keep up-to-date with the repositories means saving Internet bandwidth. The other computers connect to this mirror over the local network for updates and installing new software.