It appears that many of your concerns have been addressed by RIM. @blackberrydev just reported a Hackaton in DC July 1st. If your app is a qualified app and pulls in $1000 they will guarantee $10K, many many tools(free) many open source sample programs and tools. They will help port apps. Dev for BB playbook now easy transition to BB10. Don’t know of another platform offering as many coding options for creating apps