In my opinion, I would vote for OPTION #2.
Even if at a later date option #3 were to be something that people want to do it would still be possible and it could only raise the value of Pocket (the original).
Likewise, Option #2 opens up many more opportunities, similar to what SMT tokens do.
The only issues that seem to be a worry is the fact that many people here on Steemit have given their private posting keys out so as to get in on the many opportunities out there, like for example some of the MSP projects, hence this could pose an issue as far as the original Pocket transfer method goes.
Just thinking out aloud, and definitely agree that #2 is currently the best option out there, which doesn't close any doors, just opens new doors and opportunities.
Yes, most likely we'll need to come up with better security in the long run because of the posting key issue.