The same that many people try IP if they can change again to PHPBB3 easily.
What rubbish!
So what you are suggesting is that if you decide to switch to MyBB for example, people there should help you make the switch, and if you then decide that you don't want to use MyBB any more - They have to help you switch to any other forum software that you may fancy because you would like to "try" it.
People who write other forum software generally write conversion scripts to convert to "THEIR" forum software - And "NOT" write conversions back to other forum software.
IF! phpBB.com wants to convert people from Icy Phoenix, MyBB, SMF, IPB or any other forum software to their "OWN" - Then they create the scripts to do it.
For example:
[http://www.mybb.com/downloads/merge-system]
[http://wiki.simplemachines.org/smf/How_do_I_convert_from]
And all of the "other" forum software creators usually provide something similar to do the same thing.
I know for a fact that phpBB.com has a thread that deals with migrating from Icy Phoenix to phpBB*
HAVE YOU EVEN BOTHERED TO LOOK FOR IT?
