If you change to another ffp is a risk of the BA avios expiring due to non activity.

Having multiple ffp’s with low balances is never a good idea. You may never get enough ff miles/points to be of use before they expire. Adding frequent miles in a ff program that you can use, are worth more than ff miles in an orphan ffp that you will never use, even if the earning rate is nominally better. FFP’s are for the short to medium term.

The grass in not always greener on the other side. More so if flying few cheap flights.