Newer technologies such as iDEN network (Nextel) which allow static IP addresses and some 3G systems support incoming addressability (i.e. static IP addresses, etc) that makes push email much easier without requiring a Blackberry specific gateway. So it is possible that BYOA won't be a can of worms, for those people who choose to BYOA, and carriers/RIM is far more likely to not mind because of the clear BYOA distinction since both would still profit either way.