BIS should be made optional in BB10 or at least hived off as a separate app for other platforms
As a requent traveller, I continue to use legacy BB due to the fact that BIS is not available in BB10. BIS's superior lower data consumption due to compression makes the switch into BB10 without BIS impossible because of exorbitant data roaming charges. In quite many countries, legacy BB comes with unlimited global data roaming on BIS for as low as USD 50 a month. This is unlimited data roaming in alot of countries such as the entire USA, the entire Europe and almost the entire Asia.
Therefore if BIS is available even as an option in BB10, I believe most legacy BB owners will switch into BB10 because it is a superior OS in many respects. If BIS can be made an option for BB10 OS, then perhaps it can even be developed into an app for android and iOS users.