[xwiki-users] XWiki upgrades path?

Hi, XWiki team, It seems to me that upgrading the XWiki version on XWiki farm is very hard to do since it is not done for quite some time. Is this an indicator that maintaining an XWiki server with live sites is not easy? Is there a path for site managers to move up to the next version XWiki? Or, is there a way for users to get to the new version or get around the problems of the old version? Not everyday everyone is starting from a clean new version, everyone has to face the upgrading time. If XWiki farm sites have to stay in old, old version, I guess moving up is really difficult. It does not look good to potential new users. Thanks for thinking about this issue. Wei-hsing